Procedure

   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 the array. 

    The function returns the sum of the elements of the input array. 
 

Detailed_Input

 
    array       is the input 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 returns 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

 
    sumad_c does not check for overflow. 
 

Literature_References

 
    None. 
 

Author_and_Institution

 
    N.J. Bachman    (JPL) 
    I.M. Underwood  (JPL) 
 

Version

 
   -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