Contents

• NAME
• SYNOPSIS
  • F95 INTERFACE
  • C INTERFACE
• PURPOSE
• ARGUMENTS

NAME

     dsdot - compute the double precision dot product of two sin-
     gle precision vectors x and y.

SYNOPSIS

     DOUBLE PRECISION FUNCTION DSDOT(N, X, INCX, Y, INCY)

     INTEGER N, INCX, INCY
     REAL X(*), Y(*)

     DOUBLE PRECISION FUNCTION DSDOT_64(N, X, INCX, Y, INCY)

     INTEGER*8 N, INCX, INCY
     REAL X(*), Y(*)

  F95 INTERFACE
     REAL(8) FUNCTION DSDOT(N, X, INCX, Y, INCY)

     INTEGER :: N, INCX, INCY
     REAL, DIMENSION(:) :: X, Y

     REAL(8) FUNCTION DSDOT_64(N, X, INCX, Y, INCY)

     INTEGER(8) :: N, INCX, INCY
     REAL, DIMENSION(:) :: X, Y

  C INTERFACE
     #include <sunperf.h>

     double dsdot(int n, float *x, int incx, float *y, int incy);

     double dsdot_64(long n, float *x, long incx, float *y,  long
               incy);

PURPOSE

     dsdot compute the double precision dot product of  x  and  y
     where x and y are single precision n-vectors.

ARGUMENTS

     N (input)
               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 (input)
               ( 1 + ( n - 1 )*abs( INCX  )  ).   On  entry,  the
               incremented  array  X  must  contain the vector x.
               Unchanged on exit.

     INCX (input)
               On entry, INCX specifies  the  increment  for  the
               elements  of  X. INCX must not be zero.  Unchanged
               on exit.

     Y (input)
               ( 1 + ( n - 1 )*abs( INCY  )  ).   On  entry,  the
               incremented  array  Y  must  contain the vector y.
               Unchanged on exit.

     INCY (input)
               On entry, INCY specifies  the  increment  for  the
               elements  of  Y. INCY must not be zero.  Unchanged
               on exit.