SAXPY(3)        BLAS routine of NEC Numeric Library Collection        SAXPY(3)



NAME
       SAXPY - BLAS level one axpy subroutine

SYNOPSIS
       SUBROUTINE SAXPY    ( n, alpha, x, incx, y, incy )

           INTEGER           n, incx, incy

           REAL              alpha, x, y


DESCRIPTION
       SAXPY adds a scalar multiple of a real vector to another real vector.

       SAXPY  computes a constant alpha times a vector x plus a vector y.  The
       result overwrites the initial values of vector y.

       This routine performs the following vector operation:

            y  <--  alpha*x + y

       incx and incy specify the increment between two consecutive
       elements of respectively vector x and y.

ARGUMENTS
       n       INTEGER. (input)
               Number of elements in the vectors.  If n <= 0,  these  routines
               return without any computation.

       alpha   REAL. (input)
               If alpha = 0 this routine returns without any computation.

       x       REAL. (input)
               Array  of dimension (n-1) * |incx| + 1.  Contains the vector to
               be scaled before summation.

       incx    INTEGER. (input)
               Increment between elements of x.
               If incx = 0, the results will be unpredictable.

       y       REAL. (input and output)
               array of dimension (n-1) * |incy| + 1.
               Before calling the routine, y contains the vector to be summed.
               After the routine ends, y contains the result of the summation.

       incy    INTEGER. (input)
               Increment between elements of y.
               If incy = 0, the results will be unpredictable.

NOTES
       This routine is Level 1  Basic  Linear  Algebra  Subprograms  (Level  1
       BLAS).

       When  working  backward  (incx < 0 or incy < 0), each routine starts at
       the end of the vector and moves backward, as follows:

            x(1-incx * (n-1)), x(1-incx * (n-2)), ..., x(1)

            y(1-incy * (n-1)), y(1-incy * (n-2)), ..., y(1)

RETURN VALUES
       When n <= 0, real alpha = 0., this routine returns immediately with  no
       change in its arguments.



BLAS routine                                                          SAXPY(3)