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


Hi,

a Real is the head of floating point numbers and it is not
a good idea to attatch a function definition to it.
And look what
ComplexExpand[Re[a + I*b]]

does.

Regards

  Jens



"Carlos Felippa" <carlos at colorado.edu> schrieb im Newsbeitrag
news:cjr8lg$opp$1 at smc.vnet.net...
> 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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