
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)169.33.33.30 91128 PALAISEAU cedex  FRANCE fax: (33)169.33.30.26

