code: def vadd(v1, v2):
      
      v1 = stypes.toDoubleVector(v1)
      v2 = stypes.toDoubleVector(v2)
      vout = stypes.emptyDoubleVector(3)
      libspice.vadd_c(v1, v2, vout)
      return stypes.cVectorToPython(vout)
docs: Add two 3 dimensional vectors.
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vadd_c.html
  
      :param v1: First vector to be added. 
      :type v1: 3-Element Array of floats
      :param v2: Second vector to be added. 
      :type v2: 3-Element Array of floats
      :return: v1+v2
      :rtype: 3-Element Array of floats