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Index Page vequg_c

Table of contents

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

       vequg_c ( Vector equality, general dimension )

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

#### Abstract

       Make one double precision vector of arbitrary dimension equal
       to another.

#### Required_Reading

       None.

#### Keywords

       ASSIGNMENT
       VECTOR

#### Brief_I/O

       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       vin        I   Double precision n-dimensional vector.
       ndim       I   Dimension of `vin' (and also `vout').
       vout       O   Double precision n-dimensional vector set equal
                      to `vin'.

#### Detailed_Input

       vin         is an arbitrary, double precision n-dimensional vector.

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

#### Detailed_Output

       vout        is a double precision n-dimensional vector set equal
                   to `vin'.

#### Parameters

       None.

#### Exceptions

       Error free.

#### Files

       None.

#### Particulars

       The code simply sets each component of `vout' equal to the
       corresponding component of `vin'.

       Note that this routine may be used in place of moved_c, which
       sets each output array element equal to the corresponding
       input array element.

#### 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) Lets assume we have a pointing record that contains the
          start time of an interpolation interval, the components of
          the quaternion that represents the C-matrix associated with
          the start time of the interval, and the angular velocity vector
          of the interval. The following example demonstrates how to
          extract the time, the quaternion and the angular velocity
          vector into separate variables for their processing.

          Example code begins here.

          /.
             Program vequg_ex1
          ./
          #include <stdio.h>
          #include "SpiceUsr.h"

          int main( )
          {

             /.
             Local variables.
             ./
             SpiceDouble          av     [3];
             SpiceDouble          quat   [4];
             SpiceDouble          time;

             /.
             Define the pointing record. We would normally obtain it
             from, e.g. CK readers or other non SPICE data files.
             ./
             SpiceDouble          record [8] = { 283480.753,        0.99999622,
                                                      0.0,          0.0,
                                                     -0.0027499965, 0.0,
                                                      0.0,          0.01 };

             /.
             Get the time, quaternion and angular velocity vector
             into separate variables.
             ./
             time = record[0];

             vequg_c ( record+1, 4, quat );
             vequ_c  ( record+5,    av   );

             /.
             Display the contents of the variables.
             ./
             printf( "Time            : %10.3f\n", time );

             printf( "Quaternion      :\n" );
             printf( "%15.10f %14.10f %14.10f %14.10f\n",
                       quat[0], quat[1], quat[2], quat[3] );
             printf( "Angular velocity:\n" );
             printf( "%15.10f %14.10f %14.10f\n", av[0], av[1], av[2] );

             return ( 0 );
          }

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

          Time            : 283480.753
          Quaternion      :
             0.9999962200   0.0000000000   0.0000000000  -0.0027499965
          Angular velocity:
             0.0000000000   0.0000000000   0.0100000000

#### Restrictions

       None.

#### Literature_References

       None.

#### Author_and_Institution

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

#### Version

       -CSPICE Version 1.1.0, 23-JUL-2020 (JDR)

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

           Removed check for "ndim" being positive in order to replicate
           behaviour of SPICELIB equivalent routine.

       -CSPICE Version 1.0.0, 23-AUG-1999 (EDW) (NJB) (WMO)

#### Index_Entries

       assign an n-dimensional vector to another

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

    Fri Dec 31 18:41:14 2021