sgesc2.f man page

sgesc2.f —

Synopsis

Functions/Subroutines

subroutine sgesc2 (N, A, LDA, RHS, IPIV, JPIV, SCALE)
SGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

Function/Subroutine Documentation

subroutine sgesc2 (integerN, real, dimension( lda, * )A, integerLDA, real, dimension( * )RHS, integer, dimension( * )IPIV, integer, dimension( * )JPIV, realSCALE)

SGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

Purpose:

SGESC2 solves a system of linear equations

          A * X = scale* RHS

with a general N-by-N matrix A using the LU factorization with
complete pivoting computed by SGETC2.

Parameters:

N

N is INTEGER
The order of the matrix A.

A

A is REAL array, dimension (LDA,N)
On entry, the  LU part of the factorization of the n-by-n
matrix A computed by SGETC2:  A = P * L * U * Q

LDA

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

RHS

RHS is REAL array, dimension (N).
On entry, the right hand side vector b.
On exit, the solution vector X.

IPIV

IPIV is INTEGER array, dimension (N).
The pivot indices; for 1 <= i <= N, row i of the
matrix has been interchanged with row IPIV(i).

JPIV

JPIV is INTEGER array, dimension (N).
The pivot indices; for 1 <= j <= N, column j of the
matrix has been interchanged with column JPIV(j).

SCALE

SCALE is REAL
 On exit, SCALE contains the scale factor. SCALE is chosen
 0 <= SCALE <= 1 to prevent owerflow in the solution.

Author:

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date:

September 2012

Contributors:

Bo Kagstrom and Peter Poromaa, Department of Computing Science, Umea University, S-901 87 Umea, Sweden.

Definition at line 115 of file sgesc2.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

sgesc2(3) is an alias of sgesc2.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK