---
name: "slaswp"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/slaswp/3lapack"
---

# slaswp(3lapack)

performs a series of row interchanges on the matrix A

## NAME

SLASWP - performs a series of row interchanges on the matrix A

## 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