Index Page wncond_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

       void wncond_c ( SpiceDouble     left,
                       SpiceDouble     right,
                       SpiceCell     * window )

#### Abstract

       Contract each of the intervals of a double precision window.

#### Required_Reading

       WINDOWS

#### Keywords

       WINDOWS

#### Brief_I/O

       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       left       I   Amount added to each left endpoint.
       right      I   Amount subtracted from each right endpoint.
       window    I,O  Window to be contracted.

#### Detailed_Input

       left        is the amount to be added to the left endpoint of
                   each interval in the input window.

       right       is the amount to be subtracted from the right
                   endpoint of each interval in the window.

       window      on input, is a CSPICE window containing zero or more
                   intervals.  window must be declared as a double precision
                   SpiceCell.

#### Detailed_Output

       window      on output, is the original window with each of its
                   intervals contracted by left units on the left and
                   right units on the right.

#### Parameters

       None.

#### Exceptions

       1) If the input window does not have double precision type,
          the error SPICE(TYPEMISMATCH) is signaled.

#### Files

       None.

#### Particulars

       This routine contracts (shortens) each of the intervals in
       the input window. The adjustments are not necessarily symmetric.
       That is, left units are added to the left endpoint of each
       interval, and right units are subtracted from the right endpoint
       of each interval, where left and right may be different.

       Intervals are dropped when they are contracted by amounts
       greater than their measures.

#### Examples

       Let window contain the intervals

          [ 1, 3 ]  [ 7, 11 ]  [ 23, 27 ]  [ 29, 29 ]

       Then the following series of calls

          wncond_c (  2,  1, &window );              (1)
          wncond_c ( -2,  2, &window );              (2)
          wncond_c ( -2, -1, &window );              (3)

       produces the following series of windows

          [ 9, 10 ]  [ 25, 26 ]                      (1)
          [ 7,  8 ]  [ 23, 24 ]                      (2)
          [ 5,  9 ]  [ 21, 25 ]                      (3)

       Note that intervals may be "contracted" by negative amounts.
       In the example above, the second call shifts each interval to
       the left, while the third call undoes the effect of the first
       call (without restoring the destroyed intervals).

       Note also that the third call is exactly equivalent to the
       call

          wnexpd_c ( 2, 1, window );

#### Restrictions

       None.

#### Literature_References

       None.

#### Author_and_Institution

       N.J. Bachman    (JPL)
       H.A. Neilan     (JPL)
       W.L. Taber      (JPL)
       I.M. Underwood  (JPL)

#### Version

       -CSPICE Version 1.0.0, 21-JUL-2002 (NJB) (HAN) (WLT) (IMU)

#### Index_Entries

       contract the intervals of a d.p. window

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

    Wed Apr  5 17:54:47 2017