DGESC2 (3) Linux Manual Page

NAME

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 is INTEGER
          The order of the matrix 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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