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## csyswapr()

subroutine csyswapr | ( | character | uplo,
|  | integer | n,
|  | complex, dimension( lda, n ) | a,
|  | integer | lda,
|  | integer | i1,
|  | integer | i2 )

CSYSWAPR

Download CSYSWAPR + dependencies [TGZ] [ZIP] [TXT]

Purpose:

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

Parameters

  [in]

  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.
      !>

  [in]

  N

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

  [in,out]

  A

      !>          A is COMPLEX array, dimension (LDA,N)
      !>          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.
      !>

  [in]

  LDA

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

  [in]

  I1

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

  [in]

  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.