dlaset (3) - Linux Man Pages
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.
DLASET initializes an m-by-n matrix A to BETA on the diagonal and ALPHA on the offdiagonals.
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 is INTEGER The number of rows of the matrix A. M >= 0.
N is INTEGER The number of columns of the matrix A. N >= 0.
ALPHA is DOUBLE PRECISION The constant to which the offdiagonal elements are to be set.
BETA is DOUBLE PRECISION The constant to which the diagonal elements are to be set.
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 is INTEGER The leading dimension of the array A. LDA >= max(1,M).
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
- September 2012
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