sgst01.c File Reference

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

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Functions
int	sgst01 (int m, int n, SuperMatrix *A, SuperMatrix *L, SuperMatrix *U, int *perm_c, int *perm_r, float *resid)

Detailed Description

SGST01 reconstructs a matrix A from its L*U factorization and computes the residual.

Function Documentation

sgst01()

int sgst01	(	int	m,
		int	n,
		SuperMatrix *	A,
		SuperMatrix *	L,
		SuperMatrix *	U,
		int *	perm_c,
		int *	perm_r,
		float *	resid
	)

SGST01 reconstructs a matrix A from its L*U factorization and computes the residual norm(L*U - A) / ( N * norm(A) * EPS ), where EPS is the machine epsilon.

Parameters

[in]	m	The number of rows of the matrix A. M >= 0.
[in]	n	The number of columns of the matrix A. N >= 0.
[in]	A	The original M x N matrix A, dimension(A->nrow, A->ncol).
[in]	L	The factor matrix L, dimension(L->nrow, L->ncol).
[in]	U	The factor matrix U, dimension(U->nrow, U->ncol).
[in]	perm_c	The column permutation from SGSTRF, dimension(N).
[in]	perm_r	The pivot indices from SGSTRF, dimension(M).
[out]	resid	norm(L*U - A) / ( N * norm(A) * EPS )

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