Partial Differentiation of Interpolation Function

Question

New to mma. I have imported a 3-dimensional array from a CSV file and used the Interpolation function to make the data continuous. I am now interested in taking the partial derivative of the interpolation function with respect to one of the two variables, but am at a loss for how this is done in the language:

timein = Import["file.csv"]
Dimensions[timein]
itime = Interpolation[timein,  Method -> "Spline"]
Plot3D[itime[x, y], {x, 6, 30}, {y, 3, 24}]
D[itime, y]

Yields output of:

For the last line of the code.

Perhaps you will get better answers on http://mathematica.stackexchange.com/. — kennytm, Oct 02 '16 at 19:17
why didnt I think of that.. http://mathematica.stackexchange.com/q/127816/2079 — agentp, Oct 03 '16 at 11:34

score 0 · Answer 1 · answered Oct 03 '16 at 14:26

0

Thanks everyone, the correct form ended up being:

Derivative[0, 1][itime]

to take the first order partial derivative with respect to the second variable (y)

answered Oct 03 '16 at 14:26

aiwass

31
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Partial Differentiation of Interpolation Function

1 Answers1