dgesc2.f (3) Linux Manual Page

dgesc2.f –

Synopsis

Functions/Subroutines

subroutine dgesc2 (N, A, LDA, RHS, IPIV, JPIV, SCALE)
DGESC2 solves a system of linear equations using the LU factorization with complete pivoting computed by sgetc2.

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

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:

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 dgesc2.f.

Author

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