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cgesc2.f(3) LAPACK cgesc2.f(3)

NAME

cgesc2.f

SYNOPSIS

Functions/Subroutines


subroutine cgesc2 (N, A, LDA, RHS, IPIV, JPIV, SCALE)
CGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

Function/Subroutine Documentation

subroutine cgesc2 (integer N, complex, dimension( lda, * ) A, integer LDA, complex, dimension( * ) RHS, integer, dimension( * ) IPIV, integer, dimension( * ) JPIV, real SCALE)

CGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

Purpose:


CGESC2 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 CGETC2.

Parameters:

N


N is INTEGER
The number of columns of the matrix A.

A


A is COMPLEX array, dimension (LDA, N)
On entry, the LU part of the factorization of the n-by-n
matrix A computed by CGETC2: A = P * L * U * Q

LDA


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

RHS


RHS is COMPLEX 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:

December 2016

Contributors:

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

Definition at line 117 of file cgesc2.f.

Author

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