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Topic: Derivative of InterpolatingFunction
Replies: 3   Last Post: Jul 17, 1996 1:46 AM

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Andrei Constantinescu

Posts: 32
Registered: 12/7/04
Derivative of InterpolatingFunction
Posted: Jun 28, 1996 10:00 AM
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I have the following problem:

fct = InterpolatingFunction[{{0., 3.14159}, {0., 3.14159}}, <>]

... so its an InterpolatingFunction of 2 variables .

What I want now to do is the derivative of this function.
But I fail !

I get for example:

In[69]:= Derivative[1,0][fct]

(1,0)
Out[69]= (InterpolatingFunction[{{25., 210.}, {0., 17.}}, <>])
In[71]:= %69[100., 4.]

(1,0)
Out[71]= (InterpolatingFunction[{{25., 210.}, {0., 17.}}, <>]) [100., 4.]

which is of no practical use as you see !


However the same procedure functions if the InterpolatingFunction
has just one variable.

I guess its realted to the function definition, but I do not see how to fix it.

Any help is welcome !

Thanks !

a + andrei

______________________________________________________________________
Andrei Constantinescu constant@athena.polytechnique.fr

LMS Ecole Polytechnique tel: (33)-1-69.33.33.30
91128 PALAISEAU cedex - FRANCE fax: (33)-1-69.33.30.26







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