Procedure

   vminug_c ( Negate vector, "-v", general dimension ) 

   void vminug_c ( ConstSpiceDouble  * vin,
                   SpiceInt            ndim,
                   SpiceDouble       * vout )

Abstract

   Negate a double precision vector of arbitrary dimension.

Required_Reading

   None.

Keywords

   VECTOR

Brief_I/O

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   vin        I   n-dimensional vector to be negated.
   ndim       I   Dimension of `vin' (and also `vout').
   vout       O   Negated vector -v1.

Detailed_Input

   vin         is any double precision vector of arbitrary size.

   ndim        is the dimension of `vin' and `vout'.

Detailed_Output

   vout        is a n-dimensional double precision vector which
               contains the negation of `vin'. `vout' may overwrite `vin'.

Parameters

   None.

Exceptions

   Error free.

Files

   None.

Particulars

   For each value of the index `i' from 0 to ndim-1, vminug_c negates `vin'
   by the expression:

      vout[i] = -vin[i];

   No error checking is performed since overflow can occur ONLY if
   the dynamic range of positive floating point numbers is not the
   same size as the dynamic range of negative floating point numbers
   AND at least one component of `vin' falls outside the common range.
   The likelihood of this occurring is so small as to be of no
   concern.

Examples

   The numerical results shown for this example may differ across
   platforms. The results depend on the SPICE kernels used as
   input, the compiler and supporting libraries, and the machine
   specific arithmetic implementation.

   1) Define a set of n-dimensional vectors and negate each of them.


      Example code begins here.


      /.
         Program vminug_ex1
      ./
      #include <stdio.h>
      #include "SpiceUsr.h"

      int main( )
      {

         /.
         Local parameters.
         ./
         #define NDIM         4
         #define SETSIZ       2

         /.
         Local variables.
         ./
         SpiceDouble          vout   [NDIM];

         SpiceInt             i;

         /.
         Define a set of n-dimensional vectors.
         ./
         SpiceDouble          vin    [SETSIZ][NDIM] = {
                                   { -10.0, 15.0, -5.0, 20.0 },
                                   {   0.0,  0.0,  0.0,  0.0 } };

         /.
         Negate each vector
         ./
         for ( i = 0; i < SETSIZ; i++ )
         {

            vminug_c ( vin[i], NDIM, vout );

            printf( "Input vector  :  %6.1f %6.1f %6.1f %6.1f\n",
                       vin[i][0], vin[i][1], vin[i][2], vin[i][3] );
            printf( "Negated vector:  %6.1f %6.1f %6.1f %6.1f\n",
                               vout[0], vout[1], vout[2], vout[3] );
            printf( "\n" );

         }

         return ( 0 );
      }


      When this program was executed on a Mac/Intel/cc/64-bit
      platform, the output was:


      Input vector  :   -10.0   15.0   -5.0   20.0
      Negated vector:    10.0  -15.0    5.0  -20.0

      Input vector  :     0.0    0.0    0.0    0.0
      Negated vector:    -0.0   -0.0   -0.0   -0.0

Restrictions

   None.

Literature_References

   None.

Author_and_Institution

   J. Diaz del Rio     (ODC Space)
   W.M. Owen           (JPL)
   E.D. Wright         (JPL)

Version

   -CSPICE Version 1.0.1, 13-AUG-2021 (JDR)

       Edited the header to comply with NAIF standard. Added complete
       code example based on existing example.

       Extended -Particulars section.

   -CSPICE Version 1.0.0, 29-JUN-1999 (EDW) (WMO)

Index_Entries

   negate an n-dimensional vector