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MathGroup Archive 2006

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General--Exponential simplifications by default

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68966] General--Exponential simplifications by default
  • From: guillaume_evin at yahoo.fr
  • Date: Fri, 25 Aug 2006 05:35:30 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi !

I want to avoid simplifications when Mathematica integrates expressions with exponential terms. For example, I have :

In[8]=      Espcond[y_] = Integrate[x*Densx[x, y], {x, 0, Infinity}, Assumptions -> alpha > 0]
Out[8]=      E^(-2eta y)(-theta + E^(eta y)(2+theta))/(2alpha)

I do not want to have a factorization by E^(-2eta y). More precisely I would like to have the following result:
Out[8]=      (-theta E^(-2eta y)+ E^(-eta y)(2+theta))/(2alpha)

I guess there is a way to tackle this problem with "ComplexityFunction" and "Simplify", but I tried different things such as "ComplexityFunction -> (Count[{#1}, Exp_, ∞] &)" in the "Simplify" function but no change appears.

Is someone could give me some tricks on how tu use the "ComplexityFunction" ?

Thank you in advance.

Guillaume

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