# csyswapr.f - Man Page

SRC/csyswapr.f

## Synopsis

### Functions/Subroutines

subroutine csyswapr (uplo, n, a, lda, i1, i2)
CSYSWAPR

## Function/Subroutine Documentation

### subroutine csyswapr (character uplo, integer n, complex, dimension( lda, n ) a, integer lda, integer i1, integer i2)

CSYSWAPR

Purpose:

``` CSYSWAPR applies an elementary permutation on the rows and the columns of
a symmetric matrix.```
Parameters

UPLO

```          UPLO is CHARACTER*1
Specifies whether the details of the factorization are stored
as an upper or lower triangular matrix.
= 'U':  Upper triangular, form is A = U*D*U**T;
= 'L':  Lower triangular, form is A = L*D*L**T.```

N

```          N is INTEGER
The order of the matrix A.  N >= 0.```

A

```          A is COMPLEX array, dimension (LDA,N)
On entry, the N-by-N matrix A. On exit, the permuted matrix
where the rows I1 and I2 and columns I1 and I2 are interchanged.
If UPLO = 'U', the interchanges are applied to the upper
triangular part and the strictly lower triangular part of A is
not referenced; if UPLO = 'L', the interchanges are applied to
the lower triangular part and the part of A above the diagonal
is not referenced.```

LDA

```          LDA is INTEGER
The leading dimension of the array A.  LDA >= max(1,N).```

I1

```          I1 is INTEGER
Index of the first row to swap```

I2

```          I2 is INTEGER
Index of the second row to swap```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 99 of file csyswapr.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page csyswapr(3) is an alias of csyswapr.f(3).

Tue Nov 28 2023 12:08:41 Version 3.12.0 LAPACK