@spiceErrorCheck<EOL>def vminus(vin):
vin = stypes.toDoubleVector(vin)<EOL>vout = stypes.emptyDoubleVector(<NUM_LIT:3>)<EOL>libspice.vminus_c(vin, vout)<EOL>return stypes.cVectorToPython(vout)<EOL>
Negate a double precision 3-dimensional vector.

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

:param vin: Vector to be negated. 
:type vin: 3-Element Array of floats
:return: Negated vector -v1.
:rtype: 3-Element Array of floats