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



NAME
       DCOPY  -  BLAS level one, copies a double precision vector into another
       double precision vector

SYNOPSIS
       SUBROUTINE DCOPY    ( n, x, incx, y, incy )

           INTEGER           n, incx, incy

           DOUBLE PRECISION  x, y


DESCRIPTION
       DCOPY copies a double precision vector into  another  double  precision
       vector.  DCOPY copies a vector x, whose length is n to a vector y. incx
       and incy specify the increment  between  two  consecutive  elements  of
       respectively vector x and y.

       This routine performs the following vector operation:

            y  <--  x

       where x and y are double precision vectors.

ARGUMENTS
       n       INTEGER. (input)
               Number of vector elements to be copied.
               If n <= 0, this routine returns without computation.

       x       DOUBLE PRECISION, (input)
               Vector from which to copy.

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

       y       DOUBLE PRECISION, (output)
               array of dimension (n-1) * |incy| + 1, result vector.

       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)



BLAS routine                                                          DCOPY(3)