dlaset.f3
Usage
Functions/Subroutines
subroutine dlaset (uplo, m, n, alpha, beta, a, lda)
DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Function/Subroutine Documentation
subroutine dlaset (character uplo, integer m, integer n, double precision alpha, double precision beta, double precision, dimension( lda, * ) a, integer lda)
DLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.
Purpose:
!> !> DLASET initializes an m-by-n 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. !>
M
!> M is INTEGER !> The number of rows of the matrix A. M >= 0. !>
N
!> N is INTEGER !> The number of columns of the matrix A. N >= 0. !>
ALPHA
!> ALPHA is DOUBLE PRECISION !> The constant to which the offdiagonal elements are to be set. !>
BETA
!> BETA is DOUBLE PRECISION !> The constant to which the diagonal elements are to be set. !>
A
!> 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
!> LDA 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.
Definition at line 109 of file dlaset.f.
Releases
4 releases since Debian 7 (Wheezy); the text changed 3 times.