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MathGroup Archive 2006

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All - Re: basic complex number question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72129] All - Re: basic complex number question
  • From: Daniel Mazur <mazudan at iit.edu>
  • Date: Wed, 13 Dec 2006 06:39:20 -0500 (EST)
  • References: <eljaq8$7fm$1@smc.vnet.net> <457D3C86.60204@gmail.com>

Thanks to everyone, the ComplexExpand is the remedy.

If I define
 >  f[z_] := Sqrt[z]
then
 >  Re[f[1 + \[ImaginaryI]*3]]
just writes it up without solving, whereas
 >  ComplexExpand[Re[f[1 + \[ImaginaryI]*3]]]
actually gives the solution
------->  10^(1/4) Cos[ArcTan[3]/2]

Cheers,
Daniel

Jean-Marc Gulliet wrote:
> Daniel Mazur wrote:
>> My apologies for asking a question *this* basic, but here goes:
>> Functions Im[] and Re[] don't really evaluate imaginary and real part of
>> analytical expressions. What do I need to do to get this done?
>> Thanks,
>> Daniel
>>
>
> Daniel,
>
> Could you, please, post at least one example (or counter example) 
> illustrating what you really have in mind?
>
> Regards,
> Jean-Marc
>
>


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