# dlaset.f - Man Page

## Synopsis

### Functions/Subroutines

subroutine **dlaset** (UPLO, M, **N**, ALPHA, BETA, A, **LDA**)**DLASET** initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

## Function/Subroutine Documentation

### subroutine dlaset (character UPLO, integer M, integer N, double precision ALPHA, double precision BETA, double precision, dimension( lda, * ) A, integer LDA)

**DLASET** initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

**Purpose:**

DLASET initializes an m-by-n matrix A to BETA on the diagonal and ALPHA on the offdiagonals.

**Parameters:***UPLO*UPLO is CHARACTER*1 Specifies the part of the matrix A to be set. = 'U': Upper triangular part is set; the strictly lower triangular part of A is not changed. = 'L': Lower triangular part is set; the strictly upper triangular part of A is not changed. Otherwise: All of the matrix A is set.

*M*M is INTEGER The number of rows of the matrix A. M >= 0.

*N*N is INTEGER The number of columns of the matrix A. N >= 0.

*ALPHA*ALPHA is DOUBLE PRECISION The constant to which the offdiagonal elements are to be set.

*BETA*BETA is DOUBLE PRECISION The constant to which the diagonal elements are to be set.

*A*A is DOUBLE PRECISION array, dimension (LDA,N) On exit, the leading m-by-n submatrix of A is set as follows: if UPLO = 'U', A(i,j) = ALPHA, 1<=i<=j-1, 1<=j<=n, if UPLO = 'L', A(i,j) = ALPHA, j+1<=i<=m, 1<=j<=n, otherwise, A(i,j) = ALPHA, 1<=i<=m, 1<=j<=n, i.ne.j, and, for all UPLO, A(i,i) = BETA, 1<=i<=min(m,n).

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

**Author:**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Date:**December 2016

Definition at line 112 of file dlaset.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

Tue Nov 14 2017 Version 3.8.0 LAPACK