Compute the dot product of two vectors of arbitrary dimension.

   None.

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
    v1        I     First vector in the dot product.
    v2        I     Second vector in the dot product.
    ndim      I     Dimension of v1 and v2.

   The function returns the value of the dot product of v1 and v2.

   v1      This may be any double precision vector of arbitrary
           dimension.

   v2      This may be any double precision vector of arbitrary
           dimension.

   The function returns the value of the dot product of v1 and v2.

   None.

   vdotg_c calculates the dot product of v1 and v2 by a simple
   application of the definition.  No error checking is
   performed to prevent or recover from numeric overflow.

   Suppose that given two n-dimensional vectors, we want to change
   one of the vectors until the two vectors are perpendicular.
   The following code fragment demonstrates the use of vdot_c to do
   so.

    dot = vdotg_c ( v1, v2, ndim );

    while ( dot != 0. )
       {

         /. change one of the vectors ./
                  ....

        dot = vdotg_c ( v1, v2, ndim );
       }

   The user is responsible for determining that the vectors v1 and
   v2 are not so large as to cause numeric overflow.  In most cases
   this won't present a problem.

   1)  If ndim is not physically realistic, greater than zero, a
       BADDIMENSION error is signaled.  The value 0. is returned.

   None.

   W.M. Owen       (JPL)
   E.D. Wright     (JPL)

   None.

   -CSPICE Version 1.1.0, 22-OCT-1998 (NJB)

      Made input vectors const.  Converted check-in style to discovery.

   -CSPICE Version 1.0.0, 31-MAR-1998   (EDW)

   dot product of n-dimensional vectors