Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2005
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: symbolic complex expressions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53677] Re: symbolic complex expressions
  • From: "Scout" <user at domain.com>
  • Date: Sat, 22 Jan 2005 03:52:15 -0500 (EST)
  • References: <csqqmb$1lk$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

"Frank"
> Hi,
>
> I've 2 question with mathematica using symbolic complex expressions.
>
> - Is there a possibility to make from i.e. |x + I y| -> sprt(x^2+y^2)
> if x and y are Real. Abs[] doesn't work?
>

In[]:=
ComplexExpand[Abs[x + I y], TargetFunctions->{Re,Im}]

    This forces Math. to assume both x and y are real.

>
> - You've a fraction like this x/(x + I y) and you want to eliminate
> the complex expression in the denominator.
> i.e. doing something like this: x/(x + Iy)*(x - I y)/(x - I y) -> (x^2
> - I x y)/(x^2+y^2)
>
As above...

In[]:=
ComplexExpand[x/(x + I y), TargetFunctions->{Re,Im}]

Bye,
  ~Scout~


  • Prev by Date: Re: symbolic complex expressions
  • Next by Date: Re: Mathematica 5.0 on Windows Server 2003?
  • Previous by thread: Re: symbolic complex expressions
  • Next by thread: Re: symbolic complex expressions