@spiceErrorCheck<EOL>def drdlat(r, lon, lat):
r = ctypes.c_double(r)<EOL>lon = ctypes.c_double(lon)<EOL>lat = ctypes.c_double(lat)<EOL>jacobi = stypes.emptyDoubleMatrix()<EOL>libspice.drdlat_c(r, lon, lat, jacobi)<EOL>return stypes.cMatrixToNumpy(jacobi)<EOL>
Compute the Jacobian of the transformation from latitudinal to
rectangular coordinates.

http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/drdlat_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 lat: Angle of the point from the XY plane in radians.
:type lat: float
:return: Matrix of partial derivatives.
:rtype: 3x3-Element Array of floats