dsyswapr (3)

Functions/Subroutines

subroutine dsyswapr (UPLO, N, A, LDA, I1, I2)

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

subroutine dsyswapr (characterUPLO, integerN, double precision, dimension( lda, n )A, integerLDA, integerI1, integerI2)

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,N)
          On entry, the NB diagonal matrix D and the multipliers
          used to obtain the factor U or L as computed by DSYTRF.

          On exit, if INFO = 0, the (symmetric) inverse of the original
          matrix.  If UPLO = 'U', the upper triangular part of the
          inverse is formed and the part of A below the diagonal is not
          referenced; if UPLO = 'L' the lower triangular part of the
          inverse is formed 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.

Date:

September 2012

Definition at line 103 of file dsyswapr.f.

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