# dsyswapr.f man page

dsyswapr.f —

## Synopsis

### Functions/Subroutines

subroutinedsyswapr(UPLO, N, A, LDA, I1, I2)DSYSWAPRapplies an elementary permutation on the rows and columns of a symmetric matrix.

## Function/Subroutine Documentation

### subroutine dsyswapr (characterUPLO, integerN, double precision, dimension( lda, n )A, integerLDA, integerI1, integerI2)

**DSYSWAPR** applies an elementary permutation on the rows and columns of a symmetric matrix.

**Purpose:**

```
DSYSWAPR 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 DOUBLE PRECISION array, dimension (LDA,N)
On entry, the NB diagonal matrix D and the multipliers
used to obtain the factor U or L as computed by DSYTRF.
On exit, if INFO = 0, the (symmetric) inverse of the original
matrix. If UPLO = 'U', the upper triangular part of the
inverse is formed and the part of A below the diagonal is not
referenced; if UPLO = 'L' the lower triangular part of the
inverse is formed 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

Univ. of Colorado Denver

NAG Ltd.

**Date:**

September 2012

Definition at line 103 of file dsyswapr.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

dsyswapr(3) is an alias of dsyswapr.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK