dsyswapr.f - Man Page

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

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.