Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2000
*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 2000

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

Search the Archive

Re: a question about complex variable

  • To: mathgroup at smc.vnet.net
  • Subject: [mg21673] Re: a question about complex variable
  • From: "Robert Nowak" <robert.nowak at ims.co.at>
  • Date: Sat, 22 Jan 2000 02:52:27 -0500 (EST)
  • Organization: telecom.at (Vienna, Austria)
  • References: <200001170343.WAA13446@smc.vnet.net> <8615hh$jtk@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

try the following:

Abs[(-I Cos[2 P] - Sin[2 P]) Tan[A]]//FullSimplify[#, Element[P, Reals]] &

but for the Arg[] I am sorry ....

Regards Robert
--
---
Robert Nowak (robert.nowak at ims.co.at)
Ionen Mikrofabrikations Systeme GmbH
A-1020 Wien, Schreygasse 3, Austria
Phone: (+43 1)2144894-32, Fax: (+43 1)2144894-99

ZHU Xiaopeng <xpzhu at red.semi.ac.cn> wrote in message
news:8615hh$jtk at smc.vnet.net...
> In my algebra computation, I obtain a expression:
> C = (- I Cos[2 P] - Sin[2 P]) Tan[A]
> P,A are real variables. Apperently, the argument of C is -2(P+Pi/4) and
the
> absolute value of C is Tan[A]. But when I use Arg[C] and Abs[C],
Mathematica
> tells me:
>
> Out[41]=Abs[(-I Cos[2 P] - Sin[2 P]) Tan[A]]// FullSimplify[#, {a, P}
\[Element] Reals] &


> Out[42]=Arg[(-I Cos[2 P] - Sin[2 P]) Tan[A]]// FullSimplify[#, {a, P}
\[Element] Reals] &


>
> This problem appeared at beginning of the computation. I have no idea to
deal
> with it, so the expressions become longer and longer during the
computation.
> Can somebody help me?
>
>




  • Prev by Date: Re: Integral of x/(1+x^4) problem (in Mathematica30)
  • Next by Date: Re: Integral of x/(1+x^4) problem (in Mathematica30)
  • Previous by thread: Re: a question about complex variable
  • Next by thread: Re: Plotting A verticle line?