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MathGroup Archive 1996

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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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