---
name: "dlaset"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/dlaset/3lapack"
---

# dlaset(3lapack)

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

## NAME

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

## SYNOPSIS

- SUBROUTINE DLASET(

  UPLO, M, N, ALPHA, BETA, A, LDA )

- CHARACTER

  UPLO

- INTEGER

  LDA, M, N

- DOUBLE

  PRECISION ALPHA, BETA

- DOUBLE

  PRECISION A( LDA, \* )

## PURPOSE

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

## ARGUMENTS

- UPLO (input) 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 (input) INTEGER

  The number of rows of the matrix A.  M \>= 0.

- N (input) INTEGER

  The number of columns of the matrix A.  N \>= 0.

- ALPHA (input) DOUBLE PRECISION

  The constant to which the offdiagonal elements are to be set.

- BETA (input) DOUBLE PRECISION

  The constant to which the diagonal elements are to be set.

- A (input/output) 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 (input) INTEGER

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