@spiceErrorCheck<EOL>def vlcom(a, v1, b, v2):
v1 = stypes.toDoubleVector(v1)<EOL>v2 = stypes.toDoubleVector(v2)<EOL>sumv = stypes.emptyDoubleVector(<NUM_LIT:3>)<EOL>a = ctypes.c_double(a)<EOL>b = ctypes.c_double(b)<EOL>libspice.vlcom_c(a, v1, b, v2, sumv)<EOL>return stypes.cVectorToPython(sumv)<EOL>
Compute a vector linear combination of two double precision,
3-dimensional vectors.

http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vlcom_c.html

:param a: Coefficient of v1 
:type a: float
:param v1: Vector in 3-space 
:type v1: 3-Element Array of floats
:param b: Coefficient of v2 
:type b: float
:param v2: Vector in 3-space 
:type v2: 3-Element Array of floats
:return: Linear Vector Combination a*v1 + b*v2.
:rtype: 3-Element Array of floats