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vlcom3_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 vlcom3_c ( SpiceDouble        a, 
                   ConstSpiceDouble   v1 [3], 
                   SpiceDouble        b, 
                   ConstSpiceDouble   v2 [3], 
                   SpiceDouble        c, 
                   ConstSpiceDouble   v3 [3], 
                   SpiceDouble        sum[3]  ) 

Abstract

 
   This subroutine computes the vector linear combination 
   a*v1 + b*v2 + c*v3 of double precision, 3-dimensional vectors. 
 

Required_Reading

 
   None. 
 

Keywords

 
   VECTOR 
 

Brief_I/O

 
   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   a          I   Coefficient of v1 
   v1         I   Vector in 3-space 
   b          I   Coefficient of v2 
   v2         I   Vector in 3-space 
   c          I   Coefficient of v3 
   v3         I   Vector in 3-space 
   sum        O   Linear Vector Combination a*v1 + b*v2 + c*v3 
 

Detailed_Input

 
   a     is a double precision number. 
 
   v1    is a double precision 3-dimensional vector. 
 
   b     is a double precision number. 
 
   v2    is a double precision 3-dimensional vector. 
 
   c     is a double precision number. 
 
   v3    is a double precision 3-dimensional vector. 
 

Detailed_Output

 
   sum   is a double precision 3-dimensional vector which contains 
         the linear combination a*v1 + b*v2 + c*v3 
 

Parameters

 
   None. 
 

Exceptions

 
   Error free. 
 

Files

 
   None. 
 

Particulars

 
   For each index from 0 to 2, this routine implements in FORTRAN 
   code the expression: 
 
   sum[i] = a*v1[i] + b*v2[i] + c*v3[i] 
 
   No error checking is performed to guard against numeric overflow. 
 

Examples

 
   Often one has the components (a,b,c) of a vector in terms 
   of a basis v1, v2, v3.  The vector represented by (a,b,c) can 
   be obtained immediately from the call 
 
   vlcom3_c ( a, v1, b, v2, c, v3,   VECTOR ) 
 

Restrictions

 
   None. 
 

Literature_References

 
   None. 
 

Author_and_Institution

 
   W.L. Taber      (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

 
   linear combination of three 3-dimensional vectors 
 
Wed Apr  5 17:54:46 2017