Procedure

   void vadd_c ( ConstSpiceDouble   v1[3],
                 ConstSpiceDouble   v2[3],
                 SpiceDouble        vout[3] ) 

Abstract

 
   Add two 3 dimensional vectors. 
 

Required_Reading

 
   None. 
 

Keywords

 
   VECTOR 
 

Brief_I/O

 
   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   v1         I     First vector to be added. 
   v2         I     Second vector to be added. 
   vout       O     Sum vector, v1 + v2. 
                     vout can overwrite either v1 or v2. 
 

Detailed_Input

 
   v1      This may be any 3-element vector. 
 
   v2      Likewise. 
 

Detailed_Output

 
   vout   This is vector sum of v1 and v2. vout may overwrite either 
           v1 or v2. 
 

Parameters

 
   None. 
 

Exceptions

 
   Error free. 
 

Files

 
   None. 
 

Particulars

 
   This routine simply performs addition between components of v1 
   and v2.  No checking is performed to determine whether floating 
   point overflow has occurred. 
 

Examples

 
   The following table shows the output vout as a function of the 
   the input v1 and v2 from the subroutine vadd_c. 
 
   v1                  v2              ---> vout 
   --------------      --------------       -------------- 
   (1.0, 2.0, 3.0)     (4.0, 5.0, 6.0)      (5.0, 7.0, 9.0) 
   (1D-7,1D23,0)       (1D24, 1D23, 0.0)    (1D24,2D23,0.0) 
 

Restrictions

 
   The user is required to determine that the magnitude each 
   component of the vectors is within the appropriate range so as 
   not to cause floating point overflow. 
 

Literature_References

 
   None. 
 

Author_and_Institution

 
   W.M. Owen       (JPL) 
   E.D. Wright     (JPL)
 

Version

 
   -CSPICE Version 1.1.0, 22-OCT-1998 (NJB)

      Made input vectors const.

   -CSPICE Version 1.0.0, 08-FEB-1998 (EDW)

Index_Entries

 
   3-dimensional vector addition 
 

Link to routine vadd_c source file vadd_c.c