# dsyswapr.f - Man Page

## Synopsis

### Functions/Subroutines

subroutine **dsyswapr** (UPLO, **N**, A, **LDA**, I1, I2)**DSYSWAPR** applies an elementary permutation on the rows and columns of a symmetric matrix.

## Function/Subroutine Documentation

### subroutine dsyswapr (character UPLO, integer N, double precision, dimension( lda, n ) A, integer LDA, integer I1, integer I2)

**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:**December 2016

Definition at line 104 of file dsyswapr.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

Tue Nov 14 2017 Version 3.8.0 LAPACK