# claswp.f

Section: LAPACK (3)
Updated: Tue Nov 14 2017
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claswp.f

## SYNOPSIS

### Functions/Subroutines

subroutine claswp (N, A, LDA, K1, K2, IPIV, INCX)
CLASWP performs a series of row interchanges on a general rectangular matrix.

## Function/Subroutine Documentation

### subroutine claswp (integer N, complex, dimension( lda, * ) A, integer LDA, integer K1, integer K2, integer, dimension( * ) IPIV, integer INCX)

CLASWP performs a series of row interchanges on a general rectangular matrix.

Purpose:

``` CLASWP 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 COMPLEX 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

NAG Ltd.

Date:

June 2017

Further Details:

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

Definition at line 117 of file claswp.f.

## Author

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