@spiceErrorCheck<EOL>def vsub(v1, v2):
v1 = stypes.toDoubleVector(v1)<EOL>v2 = stypes.toDoubleVector(v2)<EOL>vout = stypes.emptyDoubleVector(<NUM_LIT:3>)<EOL>libspice.vsub_c(v1, v2, vout)<EOL>return stypes.cVectorToPython(vout)<EOL>
Compute the difference between two 3-dimensional,
double precision vectors.

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

:param v1: First vector (minuend). 
:type v1: 3-Element Array of floats
:param v2: Second vector (subtrahend). 
:type v2: 3-Element Array of floats
:return: Difference vector, v1 - v2.
:rtype: 3-Element Array of floats