dgesc2.f(3) LAPACK dgesc2.f(3)
NAME
dgesc2.f -
SYNOPSIS
Functions/Subroutines
subroutine dgesc2 (N, A, LDA, RHS, IPIV, JPIV, SCALE)
DGESC2
Function/Subroutine Documentation
subroutine dgesc2 (integerN, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( * )RHS, integer, dimension( *
)IPIV, integer, dimension( * )JPIV, double precisionSCALE)
DGESC2
Purpose:
DGESC2 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 DGETC2.
Parameters:
N
N is INTEGER
The order of the matrix A.
A
A is DOUBLE PRECISION array, dimension (LDA,N)
On entry, the LU part of the factorization of the n-by-n
matrix A computed by DGETC2: A = P * L * U * Q
LDA
LDA is INTEGER
The leading dimension of the array A. LDA >= max(1, N).
RHS
RHS is DOUBLE PRECISION 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 DOUBLE PRECISION
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:
November 2011
Contributors:
Bo Kagstrom and Peter Poromaa, Department of Computing Science, Umea University, S-901 87 Umea, Sweden.
Definition at line 115 of file dgesc2.f.
Author
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Version 3.4.1 Sun May 26 2013 dgesc2.f(3)