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Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :

ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux	CentOS 4.8	i386
	sgetrs(l)

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SGETRS

NAME
SYNOPSIS
PURPOSE
ARGUMENTS

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NAME

SGETRS - solve a system of linear equations A * X = B or A’ * X = B with a general N-by-N matrix A using the LU factorization computed by SGETRF

SYNOPSIS

	SUBROUTINE SGETRS(		TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO )
	CHARACTER		TRANS
	INTEGER		INFO, LDA, LDB, N, NRHS
	INTEGER		IPIV( * )
	REAL		A( LDA, * ), B( LDB, * )

PURPOSE

SGETRS solves a system of linear equations A * X = B or A’ * X = B with a general N-by-N matrix A using the LU factorization computed by SGETRF.

ARGUMENTS

TRANS (input) CHARACTER*1

Specifies the form of the system of equations:
= ’N’: A * X = B (No transpose)
= ’T’: A’* X = B (Transpose)
= ’C’: A’* X = B (Conjugate transpose = Transpose)

N (input) INTEGER

The order of the matrix A. N >= 0.

NRHS (input) INTEGER

The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.

A (input) REAL array, dimension (LDA,N)

The factors L and U from the factorization A = P*L*U as computed by SGETRF.

LDA (input) INTEGER

The leading dimension of the array A. LDA >= max(1,N).

IPIV (input) INTEGER array, dimension (N)

The pivot indices from SGETRF; for 1<=i<=N, row i of the matrix was interchanged with row IPIV(i).

B (input/output) REAL array, dimension (LDB,NRHS)

On entry, the right hand side matrix B. On exit, the solution matrix X.

LDB (input) INTEGER

The leading dimension of the array B. LDB >= max(1,N).

INFO (output) INTEGER

= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value

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sgetrs(l)