NAME

zgeru - perform the rank 1 operation A := alpha∗x∗y’ + A

SYNOPSIS

SUBROUTINE ZGERU
( M, N, ALPHA, X, INCX, Y, INCY, A, LDA )

COMPLEX∗16 ALPHA

INTEGER INCX, INCY, LDA, M, N

COMPLEX∗16 A( LDA, ∗ ), X( ∗ ), Y( ∗ )

PURPOSE

ZGERU  performs the rank 1 operation A := alpha∗x∗y’ + A, where alpha is a scalar, x is an m element vector, y is an n element vector and A is an m by n matrix. 
 

PARAMETERS

M      - INTEGER. 
On entry, M specifies the number of rows of the matrix A. M must be at least zero. Unchanged on exit.

N      - INTEGER. 
On entry, N specifies the number of columns of the matrix A. N must be at least zero. Unchanged on exit.

ALPHA  - COMPLEX∗16      . 
On entry, ALPHA specifies the scalar alpha. Unchanged on exit.

X      - COMPLEX∗16       array of dimension at least
( 1 + ( m - 1 )∗abs( INCX ) ). Before entry, the incremented array X must contain the m element vector x. Unchanged on exit.

INCX   - INTEGER. 
On entry, INCX specifies the increment for the elements of X. INCX must not be zero. Unchanged on exit.

Y      - COMPLEX∗16       array of dimension at least
( 1 + ( n - 1 )∗abs( INCY ) ). Before entry, the incremented array Y must contain the n element vector y. Unchanged on exit.

INCY   - INTEGER. 
On entry, INCY specifies the increment for the elements of Y. INCY must not be zero. Unchanged on exit.

A      - COMPLEX∗16       array of DIMENSION ( LDA, n ). 
Before entry, the leading m by n part of the array A must contain the matrix of coefficients. On exit, A is overwritten by the updated matrix.

LDA    - INTEGER. 
On entry, LDA specifies the first dimension of A as declared in the calling (sub) program. LDA must be at least max( 1, m ). Unchanged on exit.

SunSoft, Inc.  —  Last change: 27 Jun 1995