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dlaset.f(3) LAPACK dlaset.f(3)

NAME

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 (characterUPLO, integerM, integerN, double precisionALPHA, double precisionBETA, double precision, dimension( lda, * )A, integerLDA)

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:

September 2012

Definition at line 111 of file dlaset.f.

Author

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Tue Sep 25 2012 Version 3.4.2