vlcom3_c

 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.
```

```
None.
```

```
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
```

```
None.
```

```
Error free.
```

```
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 )
```

```
None.
```

```
None.
```

#### Author_and_Institution

```
W.L. Taber      (JPL)
E.D. Wright     (JPL)
```

#### Version

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

```
`Wed Apr  5 17:54:46 2017`