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From: Robert Kern <robert.kern@gmail.com>
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Subject: Re: sympy
Date: Wed, 30 Mar 2016 16:29:51 +0100
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On 2016-03-30 16:23, Poul Riis wrote:
> What I intend to do is to let sympy find the derivative of some welldefined function and next define the foundation derivative as a normal function so that I can calculate numerical values or even make a graph.

http://docs.sympy.org/dev/modules/utilities/lambdify.html#sympy.utilities.lambdify.lambdify

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco