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Index Page wnintd_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

       wnintd_c ( Intersect two DP windows )

       void wnintd_c ( SpiceCell  * a,
                       SpiceCell  * b,
                       SpiceCell  * c )

#### Abstract

       Place the intersection of two double precision windows into
       a third window.

#### Required_Reading

       WINDOWS

#### Keywords

       WINDOWS

#### Brief_I/O

       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       a,
       b          I   Input windows.
       c          O   Intersection of `a' and `b'.

#### Detailed_Input

       a,
       b           are SPICE windows, each of which contains zero or more
                   intervals.

                   `a' and `b' must be declared as double precision SpiceCells.

                   CSPICE provides the following macros, which declare and
                   initialize the cells

                      SPICEDOUBLE_CELL        ( a, ASZ );
                      SPICEDOUBLE_CELL        ( b, BSZ );

                   where ASZ and BSZ are the maximum capacity of `a' and `b',
                   respectively.

#### Detailed_Output

       c           is the output SPICE window, containing the intersection of
                   `a' and `b' --- every point contained in both `a' and `b'.

                   `c' must be distinct from both `a' and `b'.

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

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

                      SPICEDOUBLE_CELL        ( c, CSZ );

                   where CSZ is the maximum capacity of `c'.

#### Parameters

       None.

#### Exceptions

       1)  If the intersection of the two windows results in an excess of
           elements, the error SPICE(WINDOWEXCESS) is signaled by a
           routine in the call tree of this routine.

       2)  The cardinality of the input windows must be even. Left
           endpoints of stored intervals must be strictly greater than
           preceding right endpoints. Right endpoints must be greater
           than or equal to corresponding left endpoints. Invalid window
           data are not diagnosed by this routine and may lead to
           unpredictable results.

       3)  If any the `a', `b' or `c' cell arguments has a type other
           than SpiceDouble, the error SPICE(TYPEMISMATCH) is signaled.

#### Files

       None.

#### Particulars

       The intersection of two windows contains every point contained
       both in the first window and in the second window.

#### Examples

       Let a contain the intervals

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

       and b contain the intervals

          [ 2, 4 ]  [ 8, 10 ]  [ 16, 18 ]

       Then the intersection of a and b contains the intervals

          [ 2, 3 ]  [ 8, 10 ]

#### Restrictions

       None.

#### Literature_References

       None.

#### Author_and_Institution

       N.J. Bachman        (JPL)
       J. Diaz del Rio     (ODC Space)
       H.A. Neilan         (JPL)
       B.V. Semenov        (JPL)
       W.L. Taber          (JPL)
       I.M. Underwood      (JPL)

#### Version

       -CSPICE Version 1.0.2, 05-SEP-2021 (JDR)

           Edited the header to comply with NAIF standard. Added entry #3
           in -Exceptions section.

           Extended description of arguments "a", "b" and "c" to include
           type and preferred declaration method.

       -CSPICE Version 1.0.1, 11-FEB-2013 (BVS)

           Corrected typo in Brief I/O section.

       -CSPICE Version 1.0.0, 29-JUL-2002 (NJB) (HAN) (WLT) (IMU)

#### Index_Entries

       intersect two d.p. windows

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

    Fri Dec 31 18:41:15 2021