---
name: "slaswp.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/slaswp.f"
---

# slaswp.f(3)

## NAME

SRC/slaswp.f

## SYNOPSIS

### Functions/Subroutines

subroutine **slaswp** (n, a, lda, k1, k2, ipiv, incx)\
 **SLASWP** performs a series of row interchanges on a general rectangular matrix.

## Function/Subroutine Documentation

### subroutine slaswp (integer n, real, dimension( lda, \* ) a, integer lda, integer k1, integer k2, integer, dimension( \* ) ipiv, integer incx)

**SLASWP** performs a series of row interchanges on a general rectangular matrix.

**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.
!>
```

**Parameters**

*N*

```
!>          N is INTEGER
!>          The number of columns of the matrix A.
!>
```

*A*

```
!>          A is 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*

```
!>          LDA is INTEGER
!>          The leading dimension of the array A.
!>
```

*K1*

```
!>          K1 is INTEGER
!>          The first element of IPIV for which a row interchange will
!>          be done.
!>
```

*K2*

```
!>          K2 is INTEGER
!>          (K2-K1+1) is the number of elements of IPIV for which a row
!>          interchange will be done.
!>
```

*IPIV*

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

*INCX*

```
!>          INCX is INTEGER
!>          The increment between successive values of IPIV. If INCX
!>          is negative, the pivots are applied in reverse order.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Further Details:**

```
!>
!>  Modified by
!>   R. C. Whaley, Computer Science Dept., Univ. of Tenn., Knoxville, USA
!>
```

Definition at line **114** of file **slaswp.f**.

## Author

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