DLASWP(3f)

NAME
DLASWP - 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 (K2*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.

FURTHER DETAILS
Modified by
 R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA