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MathGroup Archive 2004

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A way around the limitations of Re[] and Im[]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51086] A way around the limitations of Re[] and Im[]
  • From: carlos at colorado.edu (Carlos Felippa)
  • Date: Mon, 4 Oct 2004 06:17:51 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

As you know, Re[expr] and Im[expr] are left unevaluated when expr is
not numeric.  I had good luck in simple cases with the following
substitution trick:
  
        Real[c_]:=c/.I->0;     Imag[c_]:=(c-Real[c])/.I->1;

Do you see any problem with these definitions?


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