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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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