Index of Functions: A B C D E F G H I J K L M N O P Q R S T U V W X
Index Page wncard_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
       wncard_c ( Cardinality of a double precision window )

       SpiceInt wncard_c ( SpiceCell  * window )
#### Abstract
       Return the cardinality (number of intervals) of a double
       precision window.
#### Required_Reading
       WINDOWS
#### Keywords
       WINDOWS
#### Brief_I/O
       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       window     I   Input window

       The function returns the window cardinality of the window.
#### Detailed_Input
       window      is a window containing zero or more intervals.

                   `window' must be declared as a double precision SpiceCell.

                   CSPICE provides the following macro, which declares and
                   initializes the cell

                      SPICEDOUBLE_CELL        ( window, WINDOWSZ );

                   where WINDOWSZ is the maximum capacity of `window'.
#### Detailed_Output
       The function returns the cardinality of (number of intervals in)
       the input window.
#### Parameters
       None.
#### Exceptions
       1)  If the number of elements in `window' is not even, the error
           SPICE(INVALIDSIZE) is signaled by a routine in the call tree
           of this routine.

       2)  If the `window' cell argument has a type other than
           SpiceDouble, the error SPICE(TYPEMISMATCH) is signaled. The
           function returns the value 0.
#### Files
       None.
#### Particulars
       This function returns the value of card_c(window)/2.
#### 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) The following code example demonstrates how to insert an
          interval into an existing double precision SPICE window, and
          how to loop over all its intervals to extract their left and
          right points.

          Example code begins here.

          /.
             Program wncard_ex1
          ./
          #include <stdio.h>
          #include "SpiceUsr.h"

          int main()
          {

             /.
             Local parameters.
             ./
             #define WNSIZE          10

             /.
             Local variables.
             ./
             SpiceDouble              left;
             SpiceDouble              right;

             SPICEDOUBLE_CELL ( window,  WNSIZE );

             SpiceInt                 i;

             /.
             Validate the window with size WNSIZE and zero elements.
             ./
             wnvald_c ( WNSIZE, 0, &window );

             /.
             Insert the intervals

                [ 1, 3 ]  [ 7, 11 ]  [ 23, 27 ]

             into `window'.
             ./
             wninsd_c (  1.0,   3.0, &window );
             wninsd_c (  7.0,  11.0, &window );
             wninsd_c ( 23.0,  27.0, &window );

             /.
             Loop over the number of intervals in `window', output
             the `left' and `right' endpoints for each interval.
             ./
             for ( i=0; i<wncard_c(&window); i++)
             {
                wnfetd_c( &window, i, &left, &right );
                printf("Interval %d [%8.3f, %8.3f]\n", i, left, right );
             }

             return ( 0 );

          }

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

          Interval 0 [   1.000,    3.000]
          Interval 1 [   7.000,   11.000]
          Interval 2 [  23.000,   27.000]
#### Restrictions
       None.
#### Literature_References
       None.
#### Author_and_Institution
       J. Diaz del Rio     (ODC Space)
       E.D. Wright         (JPL)
#### Version
       -CSPICE Version 1.0.1, 05-AUG-2021 (JDR)

           Edited the header to comply to NAIF standard. Created complete code
           example from code fragment and added example's problem statement.

           Extended description of argument "window" in -Detailed_Input to include
           type and preferred declaration method.

           Completed -Exceptions section.

       -CSPICE Version 1.0.0, 21-AUG-2007 (EDW)
#### Index_Entries
       cardinality of a d.p. window
#### Link to routine wncard_c source file wncard_c.c

    Fri Dec 31 18:41:15 2021