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

MathGroup Archive 2008

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

Search the Archive

RE: unwanted Complex result

  • To: mathgroup at smc.vnet.net
  • Subject: [mg91594] RE: [mg91589] unwanted Complex result
  • From: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>
  • Date: Thu, 28 Aug 2008 07:39:05 -0400 (EDT)
  • References: <200808280718.DAA04808@smc.vnet.net>

Hello,

I use :

Reduce[equations,vars,Reals]

I think, it's the best way...

And if you want rules, write :

ToRules[Reduce[equations,vars,Reals]]

You could also select your real solutions using "Cases", but it's more =
complicated.

Regards

F.Jaccard

-----Message d'origine-----
De : John Rivers [mailto:first10 at btinternet.com]
Envoy=E9 : jeudi, 28. ao=FBt 2008 09:19
=C0 : mathgroup at smc.vnet.net
Objet : [mg91589] unwanted Complex result

Solve[
(Sqrt[speed ^ 2 - windx ^ 2] + windy) / a speed ^ 2 + b speed + c ==
distance / height
, speed]

this works but returns 4 solutions that all return complex numbers

I need a real number

how do I:

- convert a complex result into real number
or
- solve the equation to give only real numbers




  • Prev by Date: Re: What am I doing wrong?
  • Next by Date: Re: How to get result in shape of fraction in Mathematica 4.2
  • Previous by thread: unwanted Complex result
  • Next by thread: Re: unwanted Complex result