CGERU(3f)

NAME
CGERU - perform the rank 1 operation A := alpha*x*y' + A,

SYNOPSIS

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

COMPLEX
    ALPHA

INTEGER
    INCX, INCY, LDA, M, N

COMPLEX
    A( LDA, * ), X( * ), Y( * )

PURPOSE
CGERU performs the rank 1 operation 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         .
    On entry, ALPHA specifies the scalar alpha. Unchanged on exit.

X      - COMPLEX          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          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          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. Level 2 Blas routine. -- Written on 22-October-1986. Jack Dongarra, Argonne National Lab. Jeremy Du Croz, Nag Central Office. Sven Hammarling, Nag Central Office. Richard Hanson, Sandia National Labs.