Derivative of InterpolatingFunction

• To: mathgroup at smc.vnet.net
• Subject: [mg4344] Derivative of InterpolatingFunction
• From: Andrei Constantinescu <constant at athena.polytechnique.fr>
• Date: Thu, 11 Jul 1996 00:59:50 -0400
• Sender: owner-wri-mathgroup at wolfram.com

``` 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 at 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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