LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
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◆ claset()

subroutine claset ( character uplo,
integer m,
integer n,
complex alpha,
complex beta,
complex, dimension( lda, * ) a,
integer lda )

CLASET initializes the off-diagonal elements and the diagonal elements of a matrix to given values.

Download CLASET + dependencies [TGZ] [ZIP] [TXT]

Purpose:
!>
!> CLASET initializes a 2-D array A to BETA on the diagonal and
!> ALPHA on the offdiagonals.
!>
Parameters
[in]UPLO
!>          UPLO is CHARACTER*1
!>          Specifies the part of the matrix A to be set.
!>          = 'U':      Upper triangular part is set. The lower triangle
!>                      is unchanged.
!>          = 'L':      Lower triangular part is set. The upper triangle
!>                      is unchanged.
!>          Otherwise:  All of the matrix A is set.
!>
[in]M
!>          M is INTEGER
!>          On entry, M specifies the number of rows of A.
!>
[in]N
!>          N is INTEGER
!>          On entry, N specifies the number of columns of A.
!>
[in]ALPHA
!>          ALPHA is COMPLEX
!>          All the offdiagonal array elements are set to ALPHA.
!>
[in]BETA
!>          BETA is COMPLEX
!>          All the diagonal array elements are set to BETA.
!>
[out]A
!>          A is COMPLEX array, dimension (LDA,N)
!>          On entry, the m by n matrix A.
!>          On exit, A(i,j) = ALPHA, 1 <= i <= m, 1 <= j <= n, i.ne.j;
!>                   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).
!>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.