zlaset(l) - Linux man page

Name

ZLASET - initializes a 2-D array A to BETA on the diagonal and ALPHA on the offdiagonals

Synopsis

SUBROUTINE ZLASET(

UPLO, M, N, ALPHA, BETA, A, LDA )

CHARACTER

UPLO

INTEGER

LDA, M, N

COMPLEX*16

ALPHA, BETA

COMPLEX*16

A( LDA, * )

Purpose

ZLASET initializes a 2-D array A to BETA on the diagonal and 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 lower triangle is unchanged. = 'L': Lower triangular part is set. The upper triangle is unchanged. Otherwise: All of the matrix A is set.

M (input) INTEGER

On entry, M specifies the number of rows of A.

N (input) INTEGER

On entry, N specifies the number of columns of A.

ALPHA (input) COMPLEX*16

All the offdiagonal array elements are set to ALPHA.

BETA (input) COMPLEX*16

All the diagonal array elements are set to BETA.

A (input/output) COMPLEX*16 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)

LDA (input) INTEGER

The leading dimension of the array A. LDA >= max(1,M).