@spiceErrorCheck<EOL>def drdcyl(r, lon, z):
r = ctypes.c_double(r)<EOL>lon = ctypes.c_double(lon)<EOL>z = ctypes.c_double(z)<EOL>jacobi = stypes.emptyDoubleMatrix()<EOL>libspice.drdcyl_c(r, lon, z, jacobi)<EOL>return stypes.cMatrixToNumpy(jacobi)<EOL>
This routine computes the Jacobian of the transformation from
cylindrical to rectangular coordinates.

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

:param r: Distance of a point from the origin.
:type r: float
:param lon: Angle of the point from the xz plane in radians.
:type lon: float
:param z: Height of the point above the xy plane.
:type z: float
:return: Matrix of partial derivatives.
:rtype: 3x3-Element Array of floats