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problems with condition in ReplaceAll

  • To: mathgroup at smc.vnet.net
  • Subject: [mg91464] problems with condition in ReplaceAll
  • From: frhes <frhes at bgu.ac.il>
  • Date: Fri, 22 Aug 2008 03:14:49 -0400 (EDT)

Dear discussion list:

can anybody help me to find an expression in order to replace only subexpressions of which the numerator is strictly positive in the following ReplaceAll command?

\!\(ReplaceAll[1 + 0^\((1\/\(1 - 
      Ï?\_n\))\), If[FreeQ[_, 0^_], 0^_ -> If[Assuming[{0 < Ï?\_n < 
      1}, Sign[_[\([2]\)]] > 0], 0, Hold[0]], 0^_ -> 1]]\)?

I tried to use a sign command for the second part of the subexpression which is to be tested, but obviously the pattern symbol _ is not the correct wildcard symbol.

Thank you so much

frhes


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