DLASET - Online Linux Manual Page

Section : 1
Updated : November 2008
Source : LAPACK auxiliary routine (version 3.2)
Note : LAPACK auxiliary routine (version 3.2)
NAMEDLASET - initializes an m-by-n matrix A to BETA on the diagonal and ALPHA on the offdiagonals
SYNOPSISSUBROUTINE DLASET(  UPLO, M, N, ALPHA, BETA, A, LDA )  CHARACTER UPLO  INTEGER LDA, M, N  DOUBLE PRECISION ALPHA, BETA  DOUBLE PRECISION A( LDA, * )
PURPOSEDLASET initializes an m-by-n matrix A to BETA on the diagonal and ALPHA on the offdiagonals.
ARGUMENTSUPLO (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). 0
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