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NAME
     ddot - Compute the dot product of two vectors x and y.

SYNOPSIS
     DOUBLE PRECISION FUNCTION DDOT (N, X, INCY, Y, INCY )

     INTEGER INCX, INCY, N

     DOUBLE PRECISION    X( * ), Y( * )



     #include <sunperf.h>

     double ddot(int n, double *dx, int  incx,  double  *dy,  int
               incy) ;

PURPOSE
     DDOT - Compute the dot product of x and y where x and y  are
     n-vectors.


PARAMETERS
     N         - INTEGER.
               On entry, N specifies the number  of  elements  in
               the  vector.   If N is not positive then the func-
               tion returns the value 0.0.  Unchanged on exit.

     X         - DOUBLE PRECISION array of DIMENSION at least
               ( 1 + ( n - 1 )*abs( INCX  )  ).   On  entry,  the
               incremented array X must contain the vector x.  On
               exit, the y vector.

     INCX      - INTEGER.
               On entry, INCX specifies  the  increment  for  the
               elements  of  X. INCX must not be zero.  Unchanged
               on exit.

     Y         - DOUBLE PRECISION array of DIMENSION at least
               ( 1 + ( m - 1 )*abs( INCY  )  ).   On  entry,  the
               incremented  array  Y  must  contain the 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.

Партнёры:

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