Procedure

   sumad_c ( Sum of a double precision array ) 

   SpiceDouble sumad_c ( ConstSpiceDouble   * array,
                         SpiceInt             n     )

Abstract

   Return the sum of the elements of a double precision array.

Required_Reading

   None.

Keywords

   ARRAY
   MATH
   UTILITY

Brief_I/O

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   array      I   Input array.
   n          I   Number of elements in `array'.

   The function returns the sum of the elements of `array'.

Detailed_Input

   array       is the input double precision array.

   n           is the number of elements in the array.

Detailed_Output

   The function returns the sum of the elements of the input array.
   That is,

      sumad_c( array, n ) = array[0] + array[1] + ... + array[n-1]

   If `n' is zero or negative, sumad_c is zero.

Parameters

   None.

Exceptions

   Error free.

Files

   None.

Particulars

   The value of the function is initially set to zero. The elements
   of the array are then added. If the number of elements is zero or
   negative, sumad_c is zero.

Examples

   Let `array' contain the following elements.

         array[0] = 12.
         array[1] =  1.
         array[2] =  4.
         array[3] = 75.
         array[4] = 18.

   Then

         sumad_c ( array,   -3 )       =   0.
         sumad_c ( array,    0 )       =   0.
         sumad_c ( array,    1 )       =  12.
         sumad_c ( array,    2 )       =  13.
         sumad_c ( array,    5 )       = 110.
         sumad_c ( array+2,  3 )       =  97.

Restrictions

   1)  sumad_c does not check for overflow.

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, 09-APR-2021 (JDR)

       Edited the header to comply with NAIF standard.

   -CSPICE Version 1.0.0, 24-MAR-1999 (IMU) (NJB)

Index_Entries

   sum of a d.p. array

Link to routine sumad_c source file sumad_c.c