def udf(x):
x = ctypes.c_double(x)<EOL>value = ctypes.c_double()<EOL>libspice.udf_c(x, ctypes.byref(value))<EOL>return value.value<EOL>
No-op routine for with an argument signature matching udfuns.
Allways returns 0.0 .

https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/udf_c.html

:param x: Double precision value, unused.
:type x: float
:return: Double precision value, unused.
:rtype: float