SYNOPSIS

SUBROUTINE SLASWP(

N, A, LDA, K1, K2, IPIV, INCX )

    

INTEGER INCX, K1, K2, LDA, N

    

INTEGER IPIV( * )

    

REAL A( LDA, * )

PURPOSE

SLASWP 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) REAL 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