DLASET
November 2006
Purpose
DLASET initializes an m-by-n matrix A to BETA on the diagonal and
ALPHA on the offdiagonals.
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).
|