@spiceErrorCheck<EOL>def dvnorm(state):
assert len(state) is <NUM_LIT:6><EOL>state = stypes.toDoubleVector(state)<EOL>return libspice.dvnorm_c(state)<EOL>
Function to calculate the derivative of the norm of a 3-vector.

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

:param state:
            A 6-vector composed of three coordinates and their derivatives.
:type state: 6-Element Array of floats
:return: The derivative of the norm of a 3-vector.
:rtype: float