SRC/dsyswapr.f(3)

NAME
SRC/dsyswapr.f

SYNOPSIS

  Functions/Subroutines
subroutine dsyswapr (uplo, n, a, lda, i1, i2)
DSYSWAPR applies an elementary permutation on the rows and columns of a symmetric matrix.

Function/Subroutine Documentation

  subroutine dsyswapr (character uplo, integer n, double precision, dimension( lda, * ) a, integer lda, integer i1, integer i2)

DSYSWAPR applies an elementary permutation on the rows and columns of a symmetric matrix.

Purpose:

    !>
    !> DSYSWAPR applies an elementary permutation on the rows and the columns of
    !> a symmetric matrix.
    !>

Parameters
    UPLO

    !>          UPLO is CHARACTER*1
    !>          Specifies whether the details of the factorization are stored
    !>          as an upper or lower triangular matrix.
    !>          = 'U':  Upper triangular, form is A = U*D*U**T;
    !>          = 'L':  Lower triangular, form is A = L*D*L**T.
    !>

    N

    !>          N is INTEGER
    !>          The order of the matrix A.  N >= 0.
    !>

    A

    !>          A is DOUBLE PRECISION array, dimension (LDA,*)
    !>          On entry, the N-by-N matrix A. On exit, the permuted matrix
    !>          where the rows I1 and I2 and columns I1 and I2 are interchanged.
    !>          If UPLO = 'U', the interchanges are applied to the upper
    !>          triangular part and the strictly lower triangular part of A is
    !>          not referenced; if UPLO = 'L', the interchanges are applied to
    !>          the lower triangular part and the part of A above the diagonal
    !>          is not referenced.
    !>

    LDA

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

    I1

    !>          I1 is INTEGER
    !>          Index of the first row to swap
    !>

    I2

    !>          I2 is INTEGER
    !>          Index of the second row to swap
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 99 of file dsyswapr.f.

Author

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