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

 Messages: [ Previous | Next ]
 Andrei Constantinescu Posts: 32 Registered: 12/7/04
Derivative of InterpolatingFunction
Posted: Jun 28, 1996 10:00 AM

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

Date Subject Author
6/28/96 Andrei Constantinescu
7/8/96 Mark James
7/8/96 Paul Abbott
7/17/96 Paul Abbott