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NLFitfdjac2 Method

This subroutine computes a forward-difference approximation to the m by n Jacobian matrix associated with a specified problem of m functions in n variables.

Namespace: Altaxo.Calc.Regression
Assembly: AltaxoCore (in AltaxoCore.dll) Version: 4.8.3448.0 (4.8.3448.0)
Syntax
C#
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public static void fdjac2(
	NLFitLMFunction fcn,
	int m,
	int n,
	double[] x,
	double[] fvec,
	double[] fjac,
	int ldfjac,
	ref int iflag,
	double epsfcn,
	double[] wa
)

Parameters

fcn  NLFitLMFunction
User-supplied subroutine which calculates the functions.
m  Int32
A positive integer input variable set to the number of functions.
n  Int32
A positive integer input variable set to the number of variables. n must not exceed m.
x  Double
An input array of length n containing the parameters.
fvec  Double
An input array of length m containing the function values evaluated at x.
fjac  Double
An output array (m-by-n, column-major) that receives the Jacobian approximation evaluated at x.
ldfjac  Int32
A positive integer input variable not less than m specifying the leading dimension of fjac.
iflag  Int32
An integer variable which can be used to terminate the execution of fdjac2(NLFitLMFunction, Int32, Int32, Double, Double, Double, Int32, Int32, Double, Double); see description of fcn.
epsfcn  Double
Input variable used to determine a suitable step length for the forward-difference approximation. If less than machine precision, machine precision is assumed.
wa  Double
Work array of length m.
See Also