centos man page for dgemv

dgemv.f(3)							      LAPACK								dgemv.f(3)

NAME
       dgemv.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dgemv (TRANS, M, N, ALPHA, A, LDA, X, INCX, BETA, Y, INCY)
	   DGEMV

Function/Subroutine Documentation
   subroutine dgemv (characterTRANS, integerM, integerN, double precisionALPHA, double precision, dimension(lda,*)A, integerLDA, double precision,
       dimension(*)X, integerINCX, double precisionBETA, double precision, dimension(*)Y, integerINCY)
       DGEMV Purpose:

	    DGEMV  performs one of the matrix-vector operations

	       y := alpha*A*x + beta*y,   or   y := alpha*A**T*x + beta*y,

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

       Parameters:
	   TRANS

		     TRANS is CHARACTER*1
		      On entry, TRANS specifies the operation to be performed as
		      follows:

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

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

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

	   M

		     M is INTEGER
		      On entry, M specifies the number of rows of the matrix A.
		      M must be at least zero.

	   N

		     N is INTEGER
		      On entry, N specifies the number of columns of the matrix A.
		      N must be at least zero.

	   ALPHA

		     ALPHA is DOUBLE PRECISION.
		      On entry, ALPHA specifies the scalar alpha.

	   A

		     A is DOUBLE PRECISION array of DIMENSION ( LDA, n ).
		      Before entry, the leading m by n part of the array A must
		      contain the matrix of coefficients.

	   LDA

		     LDA is 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 ).

	   X

		     X is 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.

	   INCX

		     INCX is INTEGER
		      On entry, INCX specifies the increment for the elements of
		      X. INCX must not be zero.

	   BETA

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

	   Y

		     Y is 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

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

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Further Details:

	     Level 2 Blas routine.
	     The vector and matrix arguments are not referenced when N = 0, or M = 0

	     -- 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.

       Definition at line 157 of file dgemv.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012							dgemv.f(3)