SRC/sgesc2.f(3)

NAME
SRC/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 (integer n, real, dimension( lda, * ) a, integer lda, real, dimension( * ) rhs, integer, dimension( * ) ipiv, integer, dimension( * ) jpiv, real scale)

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 overflow in the solution.
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

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

Definition at line 113 of file sgesc2.f.

Author

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