Curvilinear2D has derivative methods
Curvilinear2D has derivative methods

The _derX and _derY methods have been added to Curvilinear2Dinterp.
Tested, works as well as expected.

bolmez/Class-HARK,mnwhite/HARK,ganong123/HARK,ganong123/HARK,econ-ark/HARK,ganong123/HARK,econ-ark/HARK