# dlaset.f - Man Page

SRC/dlaset.f

## 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

NAG Ltd.

Definition at line 109 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 28 2023 12:08:42 Version 3.12.0 LAPACK