dgemv man page on YellowDog

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DGEMV(l)			 BLAS routine			      DGEMV(l)

NAME
       DGEMV  - perform one of the matrix-vector operations   y := alpha*A*x +
       beta*y, or y := alpha*A'*x + beta*y,

SYNOPSIS
       SUBROUTINE DGEMV ( TRANS, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY )

	   DOUBLE	PRECISION ALPHA, BETA

	   INTEGER	INCX, INCY, LDA, M, N

	   CHARACTER*1	TRANS

	   DOUBLE	PRECISION A( LDA, * ), X( * ), Y( * )

PURPOSE
       DGEMV  performs one of the matrix-vector operations

       where alpha and beta are scalars, x and y are vectors and A is an m  by
       n matrix.

PARAMETERS
       TRANS  - CHARACTER*1.
	      On  entry, TRANS specifies the operation to be performed as fol‐
	      lows:

	      TRANS = 'N' or 'n'   y := alpha*A*x + beta*y.

	      TRANS = 'T' or 't'   y := alpha*A'*x + beta*y.

	      TRANS = 'C' or 'c'   y := alpha*A'*x + beta*y.

	      Unchanged on exit.

       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  - DOUBLE PRECISION.
	      On entry, ALPHA specifies the scalar alpha.  Unchanged on exit.

       A      - DOUBLE PRECISION array of DIMENSION ( LDA, n ).
	      Before entry, the leading m by n part of the array A  must  con‐
	      tain the matrix of coefficients.	Unchanged on exit.

       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.

       X      - DOUBLE PRECISION array of DIMENSION at least
	      (	 1  +  (  n - 1 )*abs( INCX ) ) when TRANS = 'N' or 'n' and at
	      least ( 1 + ( m - 1 )*abs( INCX ) )  otherwise.	Before	entry,
	      the incremented array X must contain the 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.

       BETA   - DOUBLE PRECISION.
	      On  entry, BETA specifies the scalar beta. When BETA is supplied
	      as zero then Y need not be set on input.	Unchanged on exit.

       Y      - DOUBLE PRECISION array of DIMENSION at least
	      ( 1 + ( m - 1 )*abs( INCY ) ) when TRANS = 'N'  or  'n'  and  at
	      least  (	1  +  ( n - 1 )*abs( INCY ) ) otherwise.  Before entry
	      with BETA non-zero, the incremented array	 Y  must  contain  the
	      vector y. On exit, Y is overwritten by the updated vector y.

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

BLAS routine			16 October 1992			      DGEMV(l)
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