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MathGroup Archive 2008

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How to hold a form and convert it to a string

  • To: mathgroup at smc.vnet.net
  • Subject: [mg93915] How to hold a form and convert it to a string
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Fri, 28 Nov 2008 05:09:58 -0500 (EST)

Hi,

I'm sure it's a simple question but I don't get it. I want to transform
the expression

a*q + b*q^2 + c*q^3

into a C-Code form

"a*q + b*q*q + c*q*q*q"

With the rule
exp //. (Power[q_, n_] :> Times@@Array[q &, n])
for the transformation of the Power of q,
the expression is instantly reevaluated to the first form (as I expected
it). I could transform the complete first expression to a C-Form-String
and manipulate this. This would look like

f[exp_] := StringReplace[ToString@CForm[exp],
  "Power(" ~~ q_ ~~ "," ~~ n_ ~~ ")" :>
   StringJoin[Riffle[Array[ToString@q &, ToExpression[n]], "*"]]]

Isn't there a more stylish way?

Cheers
Patrick


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