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Index Page vminug_c

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Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input | Detailed_Output Parameters Exceptions Files Particulars Examples | Restrictions Literature_References Author_and_Institution Version Index_Entries

#### 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

#### Link to routine vminug_c source file vminug_c.c

    Fri Dec 31 18:41:15 2021