redhat man page for zgeru

ZGERU(l)							   BLAS routine 							  ZGERU(l)

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

       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.

	      Level 2 Blas routine.

	      -- Written on 22-October-1986.  Jack Dongarra, Argonne National Lab.  Jeremy Du Croz, Nag Central Office.  Sven Hammarling, Nag Cen-
	      tral Office.  Richard Hanson, Sandia National Labs.

BLAS routine							  16 October 1992							  ZGERU(l)