[SciPy-User] Finding Derivatives of a 2D Interpolation Using RectBivariateSpline.__call__

[Delaram Ghoreishi]

Hi. I need to find partial derivatives of 2d interpolation using
RectBivariateSpline.__call__ from scipy. This is the code that I have so
far:

import numpy as np
from scipy import interpolate
xm = np.arange(-180.,182.,2)  #rank-1 array length 181
ym = np.arange(-180.,182.,2)  #rank-1 array length 181
zm = np.loadtxt('data.dat', dtype = np.double) #rank-2 array length
(181x181)
V = interpolate.RectBivariateSpline(xm, ym, zm, s=0)

this code works fine when I need to know the value of the interpolated
function at a given point, now how should I proceed from here to also find
the derivatives at any specific point.

Thanks a lot for the help.


-- 
Delaram Ghoreishi
Ph.D. Student
Department of Physics
University of Florida
P.O. Box 118440
Gainesville, Florida 32611
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