Procedure

   bsrchd_c ( Binary search for a double precision value ) 

   SpiceInt bsrchd_c ( SpiceDouble          value,
                       SpiceInt             ndim,
                       ConstSpiceDouble   * array )

Abstract

   Do a binary search for a given value within a double precision
   array, assumed to be in nondecreasing order. Return the index of
   the matching array entry, or -1 if the key value is not found.

Required_Reading

   None.

Keywords

   ARRAY
   SEARCH

Brief_I/O

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   value      I   Value to find in `array'.
   ndim       I   Dimension of `array'.
   array      I   Array to be searched.

   The function returns the index of the input key value in the
   input array, or -1 if the value is not found.

Detailed_Input

   value       is the double precision value to be found in the input
               array.

   ndim        is the number of elements in the input array.

   array       is the double precision array to be searched. The
               elements in `array' are assumed to sorted in increasing
               order.

Detailed_Output

   The function returns the index of the specified value in the input
   array. Indices range from 0 to ndim-1.

   If the input array does not contain the specified value, the
   function returns -1.

   If the input array contains more than one occurrence of the
   specified value, the returned index may point to any of the
   occurrences.

Parameters

   None.

Exceptions

   Error free.

   1)  If ndim < 1, the value of the function is -1.

Files

   None.

Particulars

   A binary search is performed on the input array. If an element of
   the array is found to match the input value, the index of that
   element is returned. If no matching element is found, -1 is
   returned.

Examples

   Let `array' contain the following elements:

      -11.0
        0.0
       22.0
      750.0

   Then

      bsrchd_c ( -11.0, 4, array )   ==  0
      bsrchd_c (  22.0, 4, array )   ==  2
      bsrchd_c ( 751.0, 4, array )   == -1

Restrictions

   1)  `array' is assumed to be sorted in increasing order. If this
       condition is not met, the results of bsrchd_c are unpredictable.

Literature_References

   None.

Author_and_Institution

   N.J. Bachman        (JPL)
   J. Diaz del Rio     (ODC Space)
   I.M. Underwood      (JPL)

Version

   -CSPICE Version 1.0.1, 01-NOV-2021 (JDR)

       Edited the header to comply with NAIF standard.

   -CSPICE Version 1.0.0, 22-AUG-2002 (NJB) (IMU)

Index_Entries

   binary search for a double precision value

Link to routine bsrchd_c source file bsrchd_c.c