cgst04.c File Reference

#include <math.h>
#include "slu_cdefs.h"

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Functions
int	cgst04 (int n, int nrhs, singlecomplex *x, int ldx, singlecomplex *xact, int ldxact, float rcond, float *resid)

Detailed Description

CGST04 computes the difference between a computed solution and the true solution to a system of linear equations.

Function Documentation

cgst04()

int cgst04	(	int	n,
		int	nrhs,
		singlecomplex *	x,
		int	ldx,
		singlecomplex *	xact,
		int	ldxact,
		float	rcond,
		float *	resid
	)

CGST04 computes the difference between a computed solution and the true solution to a system of linear equations.

RESID = ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS ), where RCOND is the reciprocal of the condition number and EPS is the machine epsilon.

Parameters

[in]	n	The number of rows of the matrices X and XACT. N >= 0.
[in]	nrhs	The number of columns of the matrices X and XACT. NRHS >= 0.
[in]	x	The computed solution vectors. Each vector is stored as a column of the matrix X, dimension (LDX,NRHS).
[in]	ldx	The leading dimension of the array X. LDX >= max(1,N).
[in]	xact	The exact solution vectors. Each vector is stored as a column of the matrix XACT, dimension(LDX, NRHS).
[in]	ldxact	The leading dimension of the array XACT. LDXACT >= max(1,N).
[in]	rcond	The reciprocal of the condition number of the coefficient matrix in the system of equations.
[out]	resid	The maximum over the NRHS solution vectors of ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS )

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