dlaset.f (3)  Linux Man Pages
NAME
dlaset.f 
SYNOPSIS
Functions/Subroutines
subroutine dlaset (UPLO, M, N, ALPHA, BETA, A, LDA)
DLASET initializes the offdiagonal 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 offdiagonal elements and the diagonal elements of a matrix to given values.
Purpose:

DLASET initializes an mbyn 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.
MM is INTEGER The number of rows of the matrix A. M >= 0.
NN is INTEGER The number of columns of the matrix A. N >= 0.
ALPHAALPHA is DOUBLE PRECISION The constant to which the offdiagonal elements are to be set.
BETABETA is DOUBLE PRECISION The constant to which the diagonal elements are to be set.
AA is DOUBLE PRECISION array, dimension (LDA,N) On exit, the leading mbyn submatrix of A is set as follows: if UPLO = 'U', A(i,j) = ALPHA, 1<=i<=j1, 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).
LDALDA 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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