DLASWP (3lapack)

perform a series of row interchanges on the matrix A

SYNOPSIS

  SUBROUTINE DLASWP( N, A, LDA, K1, K2, IPIV, INCX )

      INTEGER        INCX, K1, K2, LDA, N

      INTEGER        IPIV( * )

      DOUBLE         PRECISION A( LDA, * )

PURPOSE

  DLASWP performs a series of row interchanges on the matrix A.  One row
  interchange is initiated for each of rows K1 through K2 of A.

ARGUMENTS

  N       (input) INTEGER
          The number of columns of the matrix A.

  A       (input/output) DOUBLE PRECISION array, dimension (LDA,N)
          On entry, the matrix of column dimension N to which the row
          interchanges will be applied.  On exit, the permuted matrix.

  LDA     (input) INTEGER
          The leading dimension of the array A.

  K1      (input) INTEGER
          The first element of IPIV for which a row interchange will be done.

  K2      (input) INTEGER
          The last element of IPIV for which a row interchange will be done.

  IPIV    (input) INTEGER array, dimension (M*abs(INCX))
          The vector of pivot indices.  Only the elements in positions K1
          through K2 of IPIV are accessed.  IPIV(K) = L implies rows K and L
          are to be interchanged.

  INCX    (input) INTEGER
          The increment between successive values of IPIV.  If IPIV is
          negative, the pivots are applied in reverse order.