# dsyswapr.f - Man Page

SRC/dsyswapr.f

## 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, * ) 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,*) 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

Univ. of Colorado Denver

NAG Ltd.

Definition at line **99** 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 28 2023 12:08:42 Version 3.12.0 LAPACK