casacore::GenericL2Fit< T > Class Template Reference

Generic base class for least-squares fit. More...

#include <FittingProxy.h>

Inheritance diagram for casacore::GenericL2Fit< T >:

Public Member Functions
	GenericL2Fit ()
	Create a fitter: the normal way to generate a fitter object. More...
	GenericL2Fit (const GenericL2Fit &other)
	Copy constructor (deep copy) More...
GenericL2Fit &	operator= (const GenericL2Fit &other)
	Assignment (deep copy) More...
virtual	~GenericL2Fit ()
	Destructor. More...
template<class U >
void	setFunction (const Function< U, U > &function)
	Sets the function to be fitted. More...
template<class U >
Bool	setConstraint (const uInt n, const Function< U, U > &function, const Vector< typename FunctionTraits< T >::BaseType > &x, const typename FunctionTraits< T >::BaseType y=typename FunctionTraits< T >::BaseType(0))
	Set the possible constraint functions. More...
Bool	setConstraint (const uInt n, const Vector< typename FunctionTraits< T >::BaseType > &x, const typename FunctionTraits< T >::BaseType y=typename FunctionTraits< T >::BaseType(0))
Bool	setConstraint (const uInt n, const typename FunctionTraits< T >::BaseType y=typename FunctionTraits< T >::BaseType(0))
Bool	addConstraint (const Function< typename FunctionTraits< T >::DiffType, typename FunctionTraits< T >::DiffType > &function, const Vector< typename FunctionTraits< T >::BaseType > &x, const typename FunctionTraits< T >::BaseType y=typename FunctionTraits< T >::BaseType(0))
Bool	addConstraint (const Vector< typename FunctionTraits< T >::BaseType > &x, const typename FunctionTraits< T >::BaseType y=typename FunctionTraits< T >::BaseType(0))
Bool	addConstraint (const typename FunctionTraits< T >::BaseType y=typename FunctionTraits< T >::BaseType(0))
void	setCollinearity (const Double cln)
	Set the collinearity factor as the square of the sine of the minimum angle allowed between input vectors (default zero for non-SVD, 1e-8 for SVD) More...
void	asWeight (const Bool aswgt)
	Set sigma values to be interpreted as weight (i.e. More...
void	asSVD (const Bool svd)
	Set the use of SVD or not (default). More...
Function< typename FunctionTraits< T >::DiffType, typename FunctionTraits< T > ::DiffType > *	fittedFunction ()
	Return a pointer to the function being fitted. More...
const Function< typename FunctionTraits< T >::DiffType, typename FunctionTraits< T > ::DiffType > *	fittedFunction () const
uInt	fittedNumber () const
	Return the number of fitted parameters. More...
uInt	NConstraints ()
	Return the number of constraints, and pointers to constraint functions. More...
Function< typename FunctionTraits< T >::DiffType, typename FunctionTraits< T > ::DiffType > *	getConstraint (const uInt n)
Vector< typename LSQTraits < typename FunctionTraits< T > ::BaseType >::base >	getSVDConstraint (uInt n)
	Return the nth constraint equation derived from SVD Note that the number present will be given by getDeficiency() More...
void	setParameterValues (const Vector< typename FunctionTraits< T >::BaseType > &parms)
	Set the parameter values. More...
void	setMaskedParameterValues (const Vector< typename FunctionTraits< T >::BaseType > &parms)
Vector< typename FunctionTraits< T >::BaseType >	fit (const Vector< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > &sigma, const Vector< Bool > *const mask=0)
	Fit the function to the data. More...
Vector< typename FunctionTraits< T >::BaseType >	fit (const Matrix< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > &sigma, const Vector< Bool > *const mask=0)
Vector< typename FunctionTraits< T >::BaseType >	fit (const Vector< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< Bool > *const mask=0)
Vector< typename FunctionTraits< T >::BaseType >	fit (const Matrix< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< Bool > *const mask=0)
Vector< typename FunctionTraits< T >::BaseType >	fit (const Vector< Bool > *const mask=0)
Bool	fit (Vector< typename FunctionTraits< T >::BaseType > &sol, const Vector< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > &sigma, const Vector< Bool > *const mask=0)
Bool	fit (Vector< typename FunctionTraits< T >::BaseType > &sol, const Matrix< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > &sigma, const Vector< Bool > *const mask=0)
Bool	fit (Vector< typename FunctionTraits< T >::BaseType > &sol, const Vector< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const typename FunctionTraits< T >::BaseType &sigma, const Vector< Bool > *const mask=0)
Bool	fit (Vector< typename FunctionTraits< T >::BaseType > &sol, const Matrix< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const typename FunctionTraits< T >::BaseType &sigma, const Vector< Bool > *const mask=0)
Bool	fit (Vector< typename FunctionTraits< T >::BaseType > &sol, const Vector< Bool > *const mask=0)
Double	chiSquare () const
	Obtain the chi squared. More...
const Vector< typename FunctionTraits< T >::BaseType > &	errors () const
	Get the errors on the solved values. More...
Bool	errors (Vector< typename FunctionTraits< T >::BaseType > &err) const
Matrix< Double >	compuCovariance ()
	Get covariance matrix. More...
void	compuCovariance (Matrix< Double > &cov)
void	buildNormalMatrix (const Vector< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > &sigma, const Vector< Bool > *const mask=0)
	Generate the normal equations by one or more calls to the buildNormalMatrix(), before calling a fit() without arguments. More...
void	buildNormalMatrix (const Matrix< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > &sigma, const Vector< Bool > *const mask=0)
void	buildNormalMatrix (const Vector< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< Bool > *const mask=0)
void	buildNormalMatrix (const Matrix< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< Bool > *const mask=0)
Bool	residual (Vector< typename FunctionTraits< T >::BaseType > &y, const Array< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &sol, const Bool model=False)
	Return the residual after a fit in y. More...
Bool	residual (Vector< typename FunctionTraits< T >::BaseType > &y, const Array< typename FunctionTraits< T >::BaseType > &x, const Bool model=False)
uInt	getRank () const
	Get the rank of the solution (or zero of no fit() done yet). More...
Public Member Functions inherited from casacore::LSQaips
	LSQaips (uInt nUnknowns, uInt nConstraints=0)
	Construct an object with the number of unknown, knowns and constraints, and type, using the default collinearity factor and the default Levenberg-Marquardt adjustment factor. More...
	LSQaips (uInt nUnknowns, const LSQReal &, uInt nConstraints=0)
	Allow explicit complex/real specification. More...
	LSQaips (uInt nUnknowns, const LSQComplex &, uInt nConstraints=0)
	LSQaips ()
	Default constructor (empty, real, only usable after a set(nUnknowns)) More...
	LSQaips (const LSQaips &other)
	Copy constructor (deep copy) More...
LSQaips &	operator= (const LSQaips &other)
	Assignment (deep copy) More...
	~LSQaips ()
template<class U >
void	solve (U *sol)
	Solve normal equations. More...
template<class U >
void	solve (std::complex< U > *sol)
template<class U >
void	solve (U &sol)
template<class U >
void	solve (Vector< U > &sol)
template<class U >
Bool	solveLoop (uInt &nRank, U *sol, Bool doSVD=False)
	Solve a Levenberg-Marquardt loop. More...
template<class U >
Bool	solveLoop (uInt &nRank, std::complex< U > *sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (uInt &nRank, U &sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (uInt &nRank, Vector< U > &sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (Double &fit, uInt &nRank, U *sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (Double &fit, uInt &nRank, std::complex< U > *sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (Double &fit, uInt &nRank, U &sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (Double &fit, uInt &nRank, Vector< U > &sol, Bool doSVD=False)
template<class U >
Bool	getCovariance (U *covar)
	Get the covariance matrix. More...
template<class U >
Bool	getCovariance (std::complex< U > *covar)
template<class U >
Bool	getCovariance (Array< U > &covar)
template<class U >
Bool	getErrors (U *errors)
	Get main diagonal of covariance function (of size nUnknowns) More...
template<class U >
Bool	getErrors (std::complex< U > *errors)
template<class U >
Bool	getErrors (U &errors)
template<class U >
Bool	getErrors (Vector< U > &errors)
Public Member Functions inherited from casacore::LSQFit
	LSQFit (uInt nUnknowns, uInt nConstraints=0)
	Construct an object with the number of unknowns and constraints, using the default collinearity factor and the default Levenberg-Marquardt adjustment factor. More...
	LSQFit (uInt nUnknowns, const LSQReal &, uInt nConstraints=0)
	Allow explicit Real specification. More...
	LSQFit (uInt nUnknowns, const LSQComplex &, uInt nConstraints=0)
	Allow explicit Complex specification. More...
	LSQFit ()
	Default constructor (empty, only usable after a set(nUnknowns)) More...
	LSQFit (const LSQFit &other)
	Copy constructor (deep copy) More...
LSQFit &	operator= (const LSQFit &other)
	Assignment (deep copy) More...
	~LSQFit ()
Bool	invert (uInt &nRank, Bool doSVD=False)
	Triangularize the normal equations and determine the rank nRank of the normal equations and, in the case of an SVD solution, the constraint equations. More...
template<class U >
void	copy (const Double *beg, const Double *end, U &sol, LSQReal)
	Copy date from beg to end; converting if necessary to complex data. More...
template<class U >
void	copy (const Double *beg, const Double *end, U &sol, LSQComplex)
template<class U >
void	copy (const Double *beg, const Double *end, U *sol, LSQReal)
template<class U >
void	copy (const Double *beg, const Double *end, U *sol, LSQComplex)
template<class U >
void	uncopy (Double *beg, const Double *end, U &sol, LSQReal)
template<class U >
void	uncopy (Double *beg, const Double *end, U &sol, LSQComplex)
template<class U >
void	uncopy (Double *beg, const Double *end, U *sol, LSQReal)
template<class U >
void	uncopy (Double *beg, const Double *end, U *sol, LSQComplex)
template<class U >
void	copyDiagonal (U &errors, LSQReal)
template<class U >
void	copyDiagonal (U &errors, LSQComplex)
template<class U >
void	solve (U *sol)
	Solve normal equations. More...
template<class U >
void	solve (std::complex< U > *sol)
template<class U >
void	solve (U &sol)
template<class U >
Bool	solveLoop (uInt &nRank, U *sol, Bool doSVD=False)
	Solve a loop in a non-linear set. More...
template<class U >
Bool	solveLoop (uInt &nRank, std::complex< U > *sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (uInt &nRank, U &sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (Double &fit, uInt &nRank, U *sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (Double &fit, uInt &nRank, std::complex< U > *sol, Bool doSVD=False)
template<class U >
Bool	solveLoop (Double &fit, uInt &nRank, U &sol, Bool doSVD=False)
template<class U , class V >
void	makeNorm (const V &cEq, const U &weight, const U &obs, Bool doNorm=True, Bool doKnown=True)
	Make normal equations using the cEq condition equation (cArray) (with nUnknowns elements) and a weight weight, given the known observed value obs. More...
template<class U , class V >
void	makeNorm (const V &cEq, const U &weight, const U &obs, LSQFit::Real, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const V &cEq, const U &weight, const std::complex< U > &obs, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Complex, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Separable, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::AsReal, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Conjugate, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const U &obs, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const V &cEq2, const U &weight, const U &obs, const U &obs2, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const U &obs, LSQFit::Real, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const std::complex< U > &obs, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Complex, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Separable, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::AsReal, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNorm (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Conjugate, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const std::vector< std::pair< uInt, V > > &cEq, const U &weight, const U &obs, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const std::vector< std::pair< uInt, V > > &cEq, const U &weight, const U &obs, LSQFit::Real, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const std::vector< std::pair< uInt, V > > &cEq, const U &weight, const std::complex< U > &obs, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const std::vector< std::pair< uInt, V > > &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Complex, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const std::vector< std::pair< uInt, V > > &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Separable, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const std::vector< std::pair< uInt, V > > &cEq, const U &weight, const std::complex< U > &obs, LSQFit::AsReal, Bool doNorm=True, Bool doKnown=True)
template<class U , class V >
void	makeNorm (const std::vector< std::pair< uInt, V > > &cEq, const U &weight, const std::complex< U > &obs, LSQFit::Conjugate, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNormSorted (uInt nIndex, const W &cEqIndex, const V &cEq, const U &weight, const U &obs, Bool doNorm=True, Bool doKnown=True)
template<class U , class V , class W >
void	makeNormSorted (uInt nIndex, const W &cEqIndex, const V &cEq, const V &cEq2, const U &weight, const U &obs, const U &obs2, Bool doNorm=True, Bool doKnown=True)
template<class U >
Bool	getConstraint (uInt n, U *cEq) const
	Get the n-th (from 0 to the rank deficiency, or missing rank, see e.g. More...
template<class U >
Bool	getConstraint (uInt n, std::complex< U > *cEq) const
template<class U >
Bool	getConstraint (uInt n, U &cEq) const
template<class U , class V >
Bool	setConstraint (uInt n, const V &cEq, const U &obs)
	Add a new constraint equation (updating nConstraints); or set a numbered constraint equation (0..nConstraints-1). More...
template<class U , class V >
Bool	setConstraint (uInt n, const V &cEq, const std::complex< U > &obs)
template<class U , class V , class W >
Bool	setConstraint (uInt n, uInt nIndex, const W &cEqIndex, const V &cEq, const U &obs)
template<class U , class V , class W >
Bool	setConstraint (uInt n, uInt nIndex, const W &cEqIndex, const V &cEq, const std::complex< U > &obs)
template<class U , class V >
Bool	addConstraint (const V &cEq, const U &obs)
template<class U , class V >
Bool	addConstraint (const V &cEq, const std::complex< U > &obs)
template<class U , class V , class W >
Bool	addConstraint (uInt nIndex, const W &cEqIndex, const V &cEq, const U &obs)
template<class U , class V , class W >
Bool	addConstraint (uInt nIndex, const W &cEqIndex, const V &cEq, const std::complex< U > &obs)
Bool	merge (const LSQFit &other)
	Merge other LSQFit object (i.e. More...
Bool	merge (const LSQFit &other, uInt nIndex, const uInt *nEqIndex)
Bool	merge (const LSQFit &other, uInt nIndex, const std::vector< uInt > &nEqIndex)
template<class W >
Bool	merge (const LSQFit &other, uInt nIndex, const W &nEqIndex)
void	reset ()
	Reset status to empty. More...
void	set (uInt nUnknowns, uInt nConstraints=0)
	Set new sizes (default is for Real) More...
void	set (Int nUnknowns, Int nConstraints=0)
void	set (uInt nUnknowns, const LSQReal &, uInt nConstraints=0)
void	set (Int nUnknowns, const LSQReal &, Int nConstraints=0)
void	set (uInt nUnknowns, const LSQComplex &, uInt nConstraints=0)
void	set (Int nUnknowns, const LSQComplex &, Int nConstraints=0)
void	set (Double factor=1e-6, Double LMFactor=1e-3)
	Set new factors (collinearity factor, and Levenberg-Marquardt LMFactor) More...
void	setEpsValue (Double epsval=1e-8)
	Set new value solution test. More...
void	setEpsDerivative (Double epsder=1e-8)
	Set new derivative test. More...
void	setMaxIter (uInt maxiter=0)
	Set maximum number of iterations. More...
uInt	nIterations () const
	Get number of iterations done. More...
void	setBalanced (Bool balanced=False)
	Set the expected form of the normal equations. More...
LSQFit::ReadyCode	isReady () const
	Ask the state of the non-linear solutions. More...
const std::string &	readyText () const
template<class U >
Bool	getCovariance (U *covar)
	Get the covariance matrix (of size nUnknowns * nUnknowns) More...
template<class U >
Bool	getCovariance (std::complex< U > *covar)
template<class U >
Bool	getErrors (U *errors)
	Get main diagonal of covariance function (of size nUnknowns) More...
template<class U >
Bool	getErrors (std::complex< U > *errors)
template<class U >
Bool	getErrors (U &errors)
uInt	nUnknowns () const
	Get the number of unknowns. More...
uInt	nConstraints () const
	Get the number of constraints. More...
uInt	getDeficiency () const
	Get the rank deficiency Warning: Note that the number is returned assuming real values; For complex values it has to be halved More...
Double	getChi () const
	Get chi^2 (both are identical); the standard deviation (per observation) and the standard deviation per weight unit. More...
Double	getChi2 () const
Double	getSD () const
Double	getWeightedSD () const
void	debugIt (uInt &nun, uInt &np, uInt &ncon, uInt &ner, uInt &rank, Double *&nEq, Double *&known, Double *&constr, Double *&er, uInt *&piv, Double *&sEq, Double *&sol, Double &prec, Double &nonlin) const
	Debug: More...
Bool	fromRecord (String &error, const RecordInterface &in)
	Create an LSQFit object from a record. More...
Bool	toRecord (String &error, RecordInterface &out) const
	Create a record from an LSQFit object. More...
const String &	ident () const
	Get identification of record. More...
void	toAipsIO (AipsIO &) const
	Save or restore using AipsIO. More...
void	fromAipsIO (AipsIO &)

Public Attributes
const Double	COLLINEARITY
	Default collinearity test for SVD. More...

Protected Member Functions
virtual Bool	fitIt (Vector< typename FunctionTraits< T >::BaseType > &sol, const Array< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > *const sigma, const Vector< Bool > *const mask=0)=0
	Generalised fitter. More...
void	buildMatrix (const Array< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > *const sigma, const Vector< Bool > *const mask=0)
	Build the normal matrix. More...
void	buildConstraint ()
	Build the constraint equations. More...
void	fillSVDConstraints ()
	Get the SVD constraints. More...
Bool	buildResidual (Vector< typename FunctionTraits< T >::BaseType > &y, const Array< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > *const sol, const Bool model=False)
	Calculate residuals. More...
FunctionTraits< T >::BaseType	getVal_p (const Array< typename FunctionTraits< T >::BaseType > &x, uInt j, uInt i) const
	Function to get evaluated functional value. More...
void	initfit_p (uInt parcnt)
	Initialise the fitter with number of solvable parameters. More...
uInt	testInput_p (const Array< typename FunctionTraits< T >::BaseType > &x, const Vector< typename FunctionTraits< T >::BaseType > &y, const Vector< typename FunctionTraits< T >::BaseType > *const sigma)
	Return number of condition equations and check sizes x, y, sigma. More...
void	resetFunction ()
	Reset all the input. More...
Protected Member Functions inherited from casacore::LSQFit
Double *	rowrt (uInt i) const
	Get pointer in rectangular array. More...
Double *	rowru (uInt i) const
void	init ()
	Initialise areas. More...
void	clear ()
	Clear areas. More...
void	deinit ()
	De-initialise area. More...
void	solveIt ()
	Solve normal equations. More...
Bool	solveItLoop (Double &fit, uInt &nRank, Bool doSVD=False)
	One non-linear LM loop. More...
void	solveMR (uInt nin)
	Solve missing rank part. More...
Bool	invertRect ()
	Invert rectangular matrix (i.e. More...
Double	normSolution (const Double *sol) const
	Get the norm of the current solution vector. More...
Double	normInfKnown (const Double *known) const
	Get the infinite norm of the known vector. More...
Bool	mergeIt (const LSQFit &other, uInt nIndex, const uInt *nEqIndex)
	Merge sparse normal equations. More...
void	save (Bool all=True)
	Save current status (or part) More...
void	restore (Bool all=True)
	Restore current status. More...
void	copy (const LSQFit &other, Bool all=True)
	Copy data. More...
void	extendConstraints (uInt n)
	Extend the constraint equation area to the specify number of equations. More...
void	createNCEQ ()
	Create the solution equation area nceq_p and fill it. More...
void	getWorkSOL ()
	Get work areas for solutions, covariance. More...
void	getWorkCOV ()

Protected Attributes
uInt	aCount_ai
	Adjustable. More...
Bool	svd_p
	SVD indicator. More...
Function< typename FunctionTraits< T >::DiffType, typename FunctionTraits< T > ::DiffType > *	ptr_derive_p
	Function to use in evaluating condition equation. More...
PtrBlock< Function< typename FunctionTraits< T >::DiffType, typename FunctionTraits< T > ::DiffType > * >	constrFun_p
	List of functions describing the possible constraint equations e.g. More...
PtrBlock< Vector< typename FunctionTraits< T >::BaseType > * >	constrArg_p
	List of vectors describing the constraint equations' arguments. More...
PtrBlock< typename FunctionTraits< T >::BaseType * >	constrVal_p
	List of values describing the constraint equations' value. More...
uInt	pCount_p
	Number of available parameters. More...
uInt	ndim_p
	Number of dimensions of input data. More...
Bool	needInit_p
	No normal equations yet. More...
Bool	solved_p
	Have solution. More...
Bool	errors_p
	Have errors. More...
Bool	ferrors_p
Bool	asweight_p
	Interpret as weights rather than as sigma the given values. More...
uInt	nr_p
	The rank of the solution. More...
Vector< typename FunctionTraits< T >::BaseType >	condEq_p
	Condition equation parameters (for number of adjustable parameters) More...
Vector< typename FunctionTraits< T >::BaseType >	fullEq_p
	Equation for all available parameters. More...
Vector< typename FunctionTraits< T >::ArgType >	arg_p
	Contiguous argument areas. More...
Vector< typename FunctionTraits< T >::ArgType >	carg_p
Vector< typename FunctionTraits< T >::BaseType >	sol_p
	Local solution area. More...
Vector< typename FunctionTraits< T >::BaseType >	fsol_p
Vector< typename FunctionTraits< T >::BaseType >	err_p
	Local error area. More...
Vector< typename FunctionTraits< T >::BaseType >	ferr_p
FunctionTraits< T >::DiffType	valder_p
	Local value and derivatives. More...
Vector< Vector< typename LSQTraits< typename FunctionTraits< T >::BaseType > ::base > >	consvd_p
	Local SVD constraints. More...
Protected Attributes inherited from casacore::LSQFit
uInt	state_p
	Bits set to indicate state. More...
uInt	nun_p
	Number of unknowns. More...
uInt	ncon_p
	Number of constraints. More...
uInt	n_p
	Matrix size (will be n_p = nun_p + ncon_p) More...
uInt	r_p
	Rank of normal equations (normally n_p) More...
Double	prec_p
	Collinearity precision. More...
Double	startnon_p
	Levenberg start factor. More...
Double	nonlin_p
	Levenberg current factor. More...
Double	stepfactor_p
	Levenberg step factor. More...
Double	epsval_p
	Test value for [incremental] solution in non-linear loop. More...
Double	epsder_p
	Test value for known vector in non-linear loop. More...
Bool	balanced_p
	Indicator for a well balanced normal equation. More...
uInt	maxiter_p
	Maximum number of iterations for non-linear solution. More...
uInt	niter_p
	Iteration count for non-linear solution. More...
ReadyCode	ready_p
	Indicate the non-linear state. More...
uInt *	piv_p
	Pivot table (n_p) More...
LSQMatrix *	norm_p
	Normal equations (triangular nun_p * nun_p) More...
uInt	nnc_p
	Current length nceq_p. More...
LSQMatrix *	nceq_p
	Normal combined with constraint equations for solutions (triangular nnc_p*nnc_p) More...
Double *	known_p
	Known part equations (n_p) More...
Double *	error_p
	Counts for errors (N_ErrorField) More...
Double *	constr_p
	Constraint equation area (nun_p*ncon_p)) More...
Double *	sol_p
	Solution area (n_p) More...
LSQFit *	nar_p
	Save area for non-linear case (size determined internally) More...
Double *	lar_p
	Save area for non-symmetric (i.e. More...
Double *	wsol_p
	Work areas for interim solutions and covariance. More...
Double *	wcov_p

Private Member Functions
void	setFunctionEx ()
	Set function properties. More...
Bool	setConstraintEx (const uInt n, const Vector< typename FunctionTraits< T >::BaseType > &x, const typename FunctionTraits< T >::BaseType y)
	Set Constraint properties. More...

Additional Inherited Members
Public Types inherited from casacore::LSQFit
enum	ReadyCode {   NONREADY,   SOLINCREMENT,   DERIVLEVEL,   MAXITER,   NOREDUCTION,   SINGULAR,   N_ReadyCode }
	State of the non-linear solution. More...
enum	ErrorField {   NC,   SUMWEIGHT,   SUMLL,   CHI2,   N_ErrorField }
	Offset of fields in error_p data area. More...
Static Public Attributes inherited from casacore::LSQFit
static Real	REAL
	And values to use. More...
static Complex	COMPLEX
static Separable	SEPARABLE
static AsReal	ASREAL
static Conjugate	CONJUGATE
Protected Types inherited from casacore::LSQFit
enum	StateBit {   INVERTED,   TRIANGLE,   NONLIN,   N_StateBit }
	Bits that can be set/referenced. More...
Static Protected Member Functions inherited from casacore::LSQFit
static Double	realMC (const std::complex< Double > &x, const std::complex< Double > &y)
	Calculate the real or imag part of x*conj(y) More...
static Double	imagMC (const std::complex< Double > &x, const std::complex< Double > &y)
static Float	realMC (const std::complex< Float > &x, const std::complex< Float > &y)
static Float	imagMC (const std::complex< Float > &x, const std::complex< Float > &y)
Static Protected Attributes inherited from casacore::LSQFit
static const String	recid
	Record field names. More...
static const String	state
static const String	nun
static const String	ncon
static const String	prec
static const String	startnon
static const String	nonlin
static const String	rank
static const String	nnc
static const String	piv
static const String	constr
static const String	known
static const String	errors
static const String	sol
static const String	lar
static const String	wsol
static const String	wcov
static const String	nceq
static const String	nar

Detailed Description

template<class T>
class casacore::GenericL2Fit< T >

Generic base class for least-squares fit.

Review Status

Reviewed By:

wbrouw

Date Reviewed:

2004/06/14

Test programs:

tLinearFitSVD

Prerequisite

• Function
• Fitting

Etymology

A set of data point is fit with some functional equation. The class acts as a generic base class for L2 type fits.

Synopsis

NOTE: Constraints added. Documentation out of date at moment, check the tLinearFitSVD and tNonLinearFitLM programs for examples.

The class acts as a base class for L2-type (least-squares) fitting. Actual classes (se e.g. LinearFit and NonLinearFit.

The following is a brief summary of the linear least-squares fit problem. See module header, Fitting, for a more complete description.

Given a set of N data points (measurements), (x(i), y(i)) i = 0,...,N-1, along with a set of standard deviations, sigma(i), for the data points, and M specified functions, f(j)(x) j = 0,...,M-1, we form a linear combination of the functions:

z(i) = a(0)f(0)(x(i)) + a(1)f(1)(x(i)) +... + a(M-1)f(M-1)(x(i)),

where a(j) j = 0,...,M-1 are a set of parameters to be determined. The linear least-squares fit tries to minimize

chi-square = [(y(0)-z(0))/sigma(0)]^2 + [(y(1)-z(1))/sigma(1)]^2 +..\.
+ [(y(N-1)-z(N-1))/sigma(N-1)]^2.

by adjusting {a(j)} in the equation.

For complex numbers, [(y(i)-z(i))/sigma(i)]^2 in chi-square is replaced by [(y(i)-z(i))/sigma(i)]*conjugate([(y(i)-z(i))/sigma(i)])

For multidimensional functions, x(i) is a vector, and

f(j)(x(i)) = f(j)(x(i,0), x(i,1), x(i,2),...)

Normally, it is necessary that N > M for the solutions to be valid, since there must be more data points than model parameters to be solved.

If the measurement errors (standard deviation sigma) are not known at all, they can all be set to one initially. In this case, we assume all measurements have the same standard deviation, after minimizing chi-square, we recompute

sigma^2 = {(y(0)-z(0))^2 + (y(1)-z(1))^2 +..\.
+ (y(N-1)-z(N-1))^2}/(N-M) = chi-square/(N-M).

A statistic weight can also be assigned to each measurement if the standard deviation is not available. sigma can be calculated from

sigma = 1/ sqrt(weight)

Alternatively a 'weight' switch can be set with asWeight(). For best arithmetic performance, weight should be normalized to a maximum value of one. Having a large weight value can sometimes lead to overflow problems.

The function to be fitted to the data can be given as an instance of the Function class. One can also form a sum of functions using the CompoundFunction.

For small datasets the usage of the calls is:

• Create a functional description of the parameters
• Create a fitter: GenericL2Fit<T> fitter();
• Set the functional representation: fitter.setFunction()
• Do the fit to the data: fitter.fit(x, data, sigma) (or do a number of calls to buildNormalMatrix(x, data, sigma) and finish of with fitter.fit() or fitter.sol())
• if needed the covariance; residuals; chiSquared, parameter errors can all be obtained

Note that the fitter is reusable. An example is given in the following.

The solution of a fit always produces the total number of parameters given to the fitter. I.e. including any parameters that were fixed. In the latter case the solution returned will be the fixed value.

Template Type Argument Requirements (T)

• The following data types can be used to instantiate the GenericL2Fit templated class: Known classes for FunctionTraits. I.e simple numerical like Float, Double, Complex, DComplex; and the AutoDiff<> versions.

If there are a large number of unknowns or a large number of data points machine memory limits (or timing reasons) may not allow a complete in-core fitting to be performed. In this case one can incrementally build the normal equation (see buildNormalMatrix()).

The normal operation of the class tests for real inversion problems only. If tests are needed for almost collinear columns in the solution matrix, the collinearity can be set as the square of the sine of the minimum angle allowed.

Singular Value Decomposition is supported by the asSVD() (which will also set the default collinearity to 1e-8).

Other information (see a.o. LSQFit) can be set and obtained as well.

Motivation

The creation of this class was driven by the need to write code to perform baseline fitting or continuum subtraction.

Example

In the following a polynomial is fitted through the first 20 prime numbers. The data is given in the x vector (1 to 20) and in the primesTable (2, 3,..., 71) (see tLinearFitSVD test program). In the following all four methods to calculate a polynomial through the data is used

// The list of coordinate x-values
Vector<Double> x(nPrimes);
indgen(x, 1.0);  // 1, 2,..\.
Vector<Double> primesTable(nPrimes);
for (uInt i=1; i < nPrimes; i++) {
primesTable(i) =
Primes::nextLargerPrimeThan(Int(primesTable(i-1)+0.01));
}   
Vector<Double> sigma(nPrimes);
sigma = 1.0;
// The fitter
LinearFit<Double> fitter;
// Linear combination of functions describing 1 + x + x*x
combination.setCoefficient(0, 1.0);   // 1
combination.setCoefficient(1, 1.0);     // x
combination.setCoefficient(2, 1.0);     // x^2
// Get the solution
fitter.setFunction(combination);
Vector<Double> solution = fitter.fit(x, primesTable, sigma);
// Try with a function with automatic derivatives (note that default 
// polynomial has zero first guess)
LinearFit<AutoDiffA<Double> > fitad;
Polynomial<AutoDiffA<Double> > sqre(2);
fitad.setFunction(sqre);
solution = fitad.fit(x, primesTable, sigma);

In the test program examples are given on how to get the other information, and other examples.

Definition at line 40 of file FittingProxy.h.

Constructor & Destructor Documentation

template<class T>

casacore::GenericL2Fit< T >::GenericL2Fit

(

)

Create a fitter: the normal way to generate a fitter object.

Necessary data will be deduced from the Functional provided with setFunction()

template<class T>

casacore::GenericL2Fit< T >::GenericL2Fit

(

const GenericL2Fit< T > &

other

)

Copy constructor (deep copy)

template<class T>

virtual casacore::GenericL2Fit< T >::~GenericL2Fit ( )

virtual

Destructor.

Member Function Documentation

template<class T>

Bool casacore::GenericL2Fit< T >::addConstraint	(	const Function< typename FunctionTraits< T >::DiffType, typename FunctionTraits< T >::DiffType > &	function,
		const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const typename FunctionTraits< T >::BaseType	y = typename FunctionTraits< T >::BaseType(0)
	)

template<class T>

Bool casacore::GenericL2Fit< T >::addConstraint	(	const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const typename FunctionTraits< T >::BaseType	y = typename FunctionTraits< T >::BaseType(0)
	)

template<class T>

Bool casacore::GenericL2Fit< T >::addConstraint

(

const typename FunctionTraits< T >::BaseType

y = typename FunctionTraits< T >::BaseType(0)

)

template<class T>

void casacore::GenericL2Fit< T >::asSVD

(

const Bool

svd

)

Set the use of SVD or not (default).

When set the default collinearity is set as well.

template<class T>

void casacore::GenericL2Fit< T >::asWeight ( const Bool  aswgt )

inline

Set sigma values to be interpreted as weight (i.e.

1/sigma/sigma). A value of zero or -1 will be skipped. The switch will stay in effect until set False again explicitly. Default is False.

Definition at line 288 of file GenericL2Fit.h.

template<class T>

void casacore::GenericL2Fit< T >::buildConstraint ( )

protected

Build the constraint equations.

template<class T>

void casacore::GenericL2Fit< T >::buildMatrix ( const Array< typename FunctionTraits< T >::BaseType > &  x, const Vector< typename FunctionTraits< T >::BaseType > &  y, const Vector< typename FunctionTraits< T >::BaseType > *const  sigma, const Vector< Bool > *const  mask = 0  )

protected

Build the normal matrix.

template<class T>

void casacore::GenericL2Fit< T >::buildNormalMatrix	(	const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< typename FunctionTraits< T >::BaseType > &	sigma,
		const Vector< Bool > *const	mask = 0
	)

Generate the normal equations by one or more calls to the buildNormalMatrix(), before calling a fit() without arguments.

The arguments are the same as for the fit(arguments) function. A False is returned if the Array sizes are unmatched.

template<class T>

void casacore::GenericL2Fit< T >::buildNormalMatrix	(	const Matrix< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< typename FunctionTraits< T >::BaseType > &	sigma,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

void casacore::GenericL2Fit< T >::buildNormalMatrix	(	const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

void casacore::GenericL2Fit< T >::buildNormalMatrix	(	const Matrix< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Bool casacore::GenericL2Fit< T >::buildResidual ( Vector< typename FunctionTraits< T >::BaseType > &  y, const Array< typename FunctionTraits< T >::BaseType > &  x, const Vector< typename FunctionTraits< T >::BaseType > *const  sol, const Bool  model = False  )

protected

Calculate residuals.

template<class T>

Double casacore::GenericL2Fit< T >::chiSquare ( ) const

inline

Obtain the chi squared.

It has already been calculated during the fitting process.

Definition at line 388 of file GenericL2Fit.h.

template<class T>

Matrix<Double> casacore::GenericL2Fit< T >::compuCovariance

(

)

Get covariance matrix.

template<class T>

void casacore::GenericL2Fit< T >::compuCovariance

(

Matrix< Double > &

cov

)

template<class T>

const Vector<typename FunctionTraits<T>::BaseType>& casacore::GenericL2Fit< T >::errors

(

)

const

Get the errors on the solved values.

Thrown Exceptions

• AipsError if none present (or Bool returned)

template<class T>

Bool casacore::GenericL2Fit< T >::errors

(

Vector< typename FunctionTraits< T >::BaseType > &

err

)

const

template<class T>

void casacore::GenericL2Fit< T >::fillSVDConstraints ( )

protected

Get the SVD constraints.

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::fit	(	const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< typename FunctionTraits< T >::BaseType > &	sigma,
		const Vector< Bool > *const	mask = 0
	)

Fit the function to the data.

If no sigma provided, all ones assumed. In the case of no x,y,sigma the fitting equations are supposed to be generated by previous calls to buildNormalMatrix. Note that the ones with a scalar sigma will assume sigma=1 (overloading problem). The mask assumes that if present, points with False will be skipped.

Thrown Exceptions

• AipsError if unmatched array sizes given
• AipsError if equations cannot be inverted (not in SVD case and in the case of the Bool versions.)

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::fit	(	const Matrix< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< typename FunctionTraits< T >::BaseType > &	sigma,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::fit	(	const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::fit	(	const Matrix< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::fit

(

const Vector< Bool > *const

mask = 0

)

template<class T>

Bool casacore::GenericL2Fit< T >::fit	(	Vector< typename FunctionTraits< T >::BaseType > &	sol,
		const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< typename FunctionTraits< T >::BaseType > &	sigma,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Bool casacore::GenericL2Fit< T >::fit	(	Vector< typename FunctionTraits< T >::BaseType > &	sol,
		const Matrix< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Vector< typename FunctionTraits< T >::BaseType > &	sigma,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Bool casacore::GenericL2Fit< T >::fit	(	Vector< typename FunctionTraits< T >::BaseType > &	sol,
		const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const typename FunctionTraits< T >::BaseType &	sigma,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Bool casacore::GenericL2Fit< T >::fit	(	Vector< typename FunctionTraits< T >::BaseType > &	sol,
		const Matrix< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	y,
		const typename FunctionTraits< T >::BaseType &	sigma,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

Bool casacore::GenericL2Fit< T >::fit	(	Vector< typename FunctionTraits< T >::BaseType > &	sol,
		const Vector< Bool > *const	mask = 0
	)

template<class T>

virtual Bool casacore::GenericL2Fit< T >::fitIt ( Vector< typename FunctionTraits< T >::BaseType > &  sol, const Array< typename FunctionTraits< T >::BaseType > &  x, const Vector< typename FunctionTraits< T >::BaseType > &  y, const Vector< typename FunctionTraits< T >::BaseType > *const  sigma, const Vector< Bool > *const  mask = 0  )

protectedpure virtual

Generalised fitter.

Implemented in casacore::LinearFit< T >, casacore::NonLinearFit< T >, casacore::NonLinearFit< Double >, casacore::NonLinearFitLM< T >, and casacore::NonLinearFitLM< Double >.

template<class T>

Function<typename FunctionTraits<T>::DiffType, typename FunctionTraits<T>::DiffType>* casacore::GenericL2Fit< T >::fittedFunction ( )

inline

Return a pointer to the function being fitted.

Should never delete this pointer.

Definition at line 298 of file GenericL2Fit.h.

template<class T>

const Function<typename FunctionTraits<T>::DiffType, typename FunctionTraits<T>::DiffType>* casacore::GenericL2Fit< T >::fittedFunction ( ) const

inline

Definition at line 302 of file GenericL2Fit.h.

template<class T>

uInt casacore::GenericL2Fit< T >::fittedNumber ( ) const

inline

Return the number of fitted parameters.

Definition at line 305 of file GenericL2Fit.h.

template<class T>

Function<typename FunctionTraits<T>::DiffType, typename FunctionTraits<T>::DiffType>* casacore::GenericL2Fit< T >::getConstraint ( const uInt  n )

inline

Definition at line 313 of file GenericL2Fit.h.

template<class T>

uInt casacore::GenericL2Fit< T >::getRank ( ) const

inline

Get the rank of the solution (or zero of no fit() done yet).

A valid solution will have the same rank as the number of unknowns (or double that number in the complex case). For SVD solutions the rank could be less.

Definition at line 454 of file GenericL2Fit.h.

template<class T>

Vector<typename LSQTraits<typename FunctionTraits<T>:: BaseType>::base> casacore::GenericL2Fit< T >::getSVDConstraint

(

uInt

n

)

Return the nth constraint equation derived from SVD Note that the number present will be given by getDeficiency()

template<class T>

FunctionTraits<T>::BaseType casacore::GenericL2Fit< T >::getVal_p ( const Array< typename FunctionTraits< T >::BaseType > &  x, uInt  j, uInt  i  ) const

protected

Function to get evaluated functional value.

template<class T>

void casacore::GenericL2Fit< T >::initfit_p ( uInt  parcnt )

protected

Initialise the fitter with number of solvable parameters.

template<class T>

uInt casacore::GenericL2Fit< T >::NConstraints ( )

inline

Return the number of constraints, and pointers to constraint functions.

A 0-pointer will be returned if no such constraint present. This pointer should never be destroyed.

Definition at line 311 of file GenericL2Fit.h.

template<class T>

GenericL2Fit& casacore::GenericL2Fit< T >::operator=

(

const GenericL2Fit< T > &

other

)

Assignment (deep copy)

template<class T>

void casacore::GenericL2Fit< T >::resetFunction ( )

protected

Reset all the input.

Referenced by casacore::GenericL2Fit< DComplex >::setFunction().

template<class T>

Bool casacore::GenericL2Fit< T >::residual	(	Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Array< typename FunctionTraits< T >::BaseType > &	x,
		const Vector< typename FunctionTraits< T >::BaseType > &	sol,
		const Bool	model = False
	)

Return the residual after a fit in y.

x can be a vector (if 1D function) or a matrix (ND functional), as in the fit() methods. If sol is given, it is the solution derived from a fit and its value will be used; otherwise only the parameters in the fitted functional will be used. If model is given as True, the model, rather the residual <data>-<model> will be returned in y. False is returned if residuals cannot be calculated.

Thrown Exceptions

• Aipserror if illegal array sizes

template<class T>

Bool casacore::GenericL2Fit< T >::residual	(	Vector< typename FunctionTraits< T >::BaseType > &	y,
		const Array< typename FunctionTraits< T >::BaseType > &	x,
		const Bool	model = False
	)

template<class T>

void casacore::GenericL2Fit< T >::setCollinearity

(

const Double

cln

)

Set the collinearity factor as the square of the sine of the minimum angle allowed between input vectors (default zero for non-SVD, 1e-8 for SVD)

template<class T>

template<class U >

Bool casacore::GenericL2Fit< T >::setConstraint ( const uInt  n, const Function< U, U > &  function, const Vector< typename FunctionTraits< T >::BaseType > &  x, const typename FunctionTraits< T >::BaseType  y = typename FunctionTraits<T>::BaseType(0)  )

inline

Set the possible constraint functions.

The addConstraint will add one; the setConstraint will [re-]set the nth constraint. If unsucessful, False returned.
Constraint functional can only be set when the function to be fitted has been set. It should have the same number of parameters as the function to be fitted. The x should have the correct dimension.

Definition at line 251 of file GenericL2Fit.h.

template<class T>

Bool casacore::GenericL2Fit< T >::setConstraint	(	const uInt	n,
		const Vector< typename FunctionTraits< T >::BaseType > &	x,
		const typename FunctionTraits< T >::BaseType	y = typename FunctionTraits< T >::BaseType(0)
	)

template<class T>

Bool casacore::GenericL2Fit< T >::setConstraint	(	const uInt	n,
		const typename FunctionTraits< T >::BaseType	y = typename FunctionTraits< T >::BaseType(0)
	)

template<class T>

Bool casacore::GenericL2Fit< T >::setConstraintEx ( const uInt  n, const Vector< typename FunctionTraits< T >::BaseType > &  x, const typename FunctionTraits< T >::BaseType  y  )

private

Set Constraint properties.

Referenced by casacore::GenericL2Fit< DComplex >::setConstraint().

template<class T>

template<class U >

void casacore::GenericL2Fit< T >::setFunction ( const Function< U, U > &  function )

inline

Sets the function to be fitted.

Upon entry, the argument function object is cloned. The cloned copy is used in the later fitting process. A valid function should be an instance of the Function class, so that derivatives with respect to the adjustable parameters can be calculated. The current values of the "available" parameters of the function are taken as the initial guess for the non-linear fitting.

Definition at line 240 of file GenericL2Fit.h.

template<class T>

void casacore::GenericL2Fit< T >::setFunctionEx ( )

private

Set function properties.

Referenced by casacore::GenericL2Fit< DComplex >::setFunction().

template<class T>

void casacore::GenericL2Fit< T >::setMaskedParameterValues

(

const Vector< typename FunctionTraits< T >::BaseType > &

parms

)

template<class T>

void casacore::GenericL2Fit< T >::setParameterValues

(

const Vector< typename FunctionTraits< T >::BaseType > &

parms

)

Set the parameter values.

The input is a vector of parameters; all or only the masked ones' values will be set, using the input values

template<class T>

uInt casacore::GenericL2Fit< T >::testInput_p ( const Array< typename FunctionTraits< T >::BaseType > &  x, const Vector< typename FunctionTraits< T >::BaseType > &  y, const Vector< typename FunctionTraits< T >::BaseType > *const  sigma  )

protected

Return number of condition equations and check sizes x, y, sigma.

Thrown Exceptions

• Aipserror if size inconsistencies

Member Data Documentation

template<class T>

uInt casacore::GenericL2Fit< T >::aCount_ai

protected

Adjustable.

Definition at line 460 of file GenericL2Fit.h.

Referenced by casacore::GenericL2Fit< DComplex >::fittedNumber().

template<class T>

Vector<typename FunctionTraits<T>::ArgType> casacore::GenericL2Fit< T >::arg_p

mutableprotected

Contiguous argument areas.

Definition at line 500 of file GenericL2Fit.h.

template<class T>

Bool casacore::GenericL2Fit< T >::asweight_p

protected

Interpret as weights rather than as sigma the given values.

Definition at line 491 of file GenericL2Fit.h.

Referenced by casacore::GenericL2Fit< DComplex >::asWeight().

template<class T>

Vector<typename FunctionTraits<T>::ArgType> casacore::GenericL2Fit< T >::carg_p

mutableprotected

Definition at line 501 of file GenericL2Fit.h.

template<class T>

const Double casacore::GenericL2Fit< T >::COLLINEARITY

Default collinearity test for SVD.

Definition at line 217 of file GenericL2Fit.h.

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::condEq_p

mutableprotected

Condition equation parameters (for number of adjustable parameters)

Definition at line 495 of file GenericL2Fit.h.

template<class T>

PtrBlock<Vector<typename FunctionTraits<T>::BaseType>*> casacore::GenericL2Fit< T >::constrArg_p

protected

List of vectors describing the constraint equations' arguments.

Definition at line 475 of file GenericL2Fit.h.

template<class T>

PtrBlock<Function<typename FunctionTraits<T>::DiffType, typename FunctionTraits<T>::DiffType>*> casacore::GenericL2Fit< T >::constrFun_p

protected

List of functions describing the possible constraint equations e.g.

The sum of 3 angles w`could be described by a HyperPlane(3) function with [1,1,1] as parameters; giving [1,1,1] as argument vector and 3.1415 as value.

Definition at line 473 of file GenericL2Fit.h.

Referenced by casacore::GenericL2Fit< DComplex >::getConstraint(), casacore::GenericL2Fit< DComplex >::NConstraints(), and casacore::GenericL2Fit< DComplex >::setConstraint().

template<class T>

PtrBlock<typename FunctionTraits<T>::BaseType *> casacore::GenericL2Fit< T >::constrVal_p

protected

List of values describing the constraint equations' value.

Definition at line 477 of file GenericL2Fit.h.

template<class T>

Vector<Vector<typename LSQTraits<typename FunctionTraits<T>:: BaseType>::base> > casacore::GenericL2Fit< T >::consvd_p

mutableprotected

Local SVD constraints.

Definition at line 517 of file GenericL2Fit.h.

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::err_p

mutableprotected

Local error area.

Definition at line 510 of file GenericL2Fit.h.

template<class T>

Bool casacore::GenericL2Fit< T >::errors_p

protected

Have errors.

Definition at line 488 of file GenericL2Fit.h.

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::ferr_p

mutableprotected

Definition at line 511 of file GenericL2Fit.h.

template<class T>

Bool casacore::GenericL2Fit< T >::ferrors_p

mutableprotected

Definition at line 489 of file GenericL2Fit.h.

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::fsol_p

mutableprotected

Definition at line 506 of file GenericL2Fit.h.

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::fullEq_p

mutableprotected

Equation for all available parameters.

Definition at line 497 of file GenericL2Fit.h.

template<class T>

uInt casacore::GenericL2Fit< T >::ndim_p

protected

Number of dimensions of input data.

Definition at line 482 of file GenericL2Fit.h.

template<class T>

Bool casacore::GenericL2Fit< T >::needInit_p

protected

No normal equations yet.

Definition at line 484 of file GenericL2Fit.h.

template<class T>

uInt casacore::GenericL2Fit< T >::nr_p

protected

The rank of the solution.

Definition at line 493 of file GenericL2Fit.h.

template<class T>

uInt casacore::GenericL2Fit< T >::pCount_p

protected

Number of available parameters.

Definition at line 480 of file GenericL2Fit.h.

template<class T>

Function<typename FunctionTraits<T>::DiffType, typename FunctionTraits<T>::DiffType>* casacore::GenericL2Fit< T >::ptr_derive_p

protected

Function to use in evaluating condition equation.

Definition at line 465 of file GenericL2Fit.h.

Referenced by casacore::GenericL2Fit< DComplex >::fittedFunction(), casacore::GenericL2Fit< DComplex >::setConstraint(), and casacore::GenericL2Fit< DComplex >::setFunction().

template<class T>

Vector<typename FunctionTraits<T>::BaseType> casacore::GenericL2Fit< T >::sol_p

mutableprotected

Local solution area.

Definition at line 505 of file GenericL2Fit.h.

template<class T>

Bool casacore::GenericL2Fit< T >::solved_p

protected

Have solution.

Definition at line 486 of file GenericL2Fit.h.

Referenced by casacore::GenericL2Fit< DComplex >::getRank().

template<class T>

Bool casacore::GenericL2Fit< T >::svd_p

protected

SVD indicator.

Definition at line 462 of file GenericL2Fit.h.

template<class T>

FunctionTraits<T>::DiffType casacore::GenericL2Fit< T >::valder_p

mutableprotected

Local value and derivatives.

Definition at line 514 of file GenericL2Fit.h.

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The documentation for this class was generated from the following files:

• scimath/Fitting/FittingProxy.h
• scimath/Fitting/GenericL2Fit.h