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LAPACK
3.7.0
LAPACK: Linear Algebra PACKage
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subroutine slaset | ( | character | UPLO, |
integer | M, | ||
integer | N, | ||
real | ALPHA, | ||
real | BETA, | ||
real, dimension( lda, * ) | A, | ||
integer | LDA | ||
) |
SLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Download SLASET + dependencies [TGZ] [ZIP] [TXT]
SLASET initializes an m-by-n matrix A to BETA on the diagonal and ALPHA on the offdiagonals.
[in] | 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. |
[in] | M | M is INTEGER The number of rows of the matrix A. M >= 0. |
[in] | N | N is INTEGER The number of columns of the matrix A. N >= 0. |
[in] | ALPHA | ALPHA is REAL The constant to which the offdiagonal elements are to be set. |
[in] | BETA | BETA is REAL The constant to which the diagonal elements are to be set. |
[out] | A | A is REAL 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). |
[in] | LDA | LDA is INTEGER The leading dimension of the array A. LDA >= max(1,M). |
Definition at line 112 of file slaset.f.