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: solve output "problem"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59025] Re: [mg58974] solve output "problem"
  • From: Pratik Desai <pdesai1 at umbc.edu>
  • Date: Wed, 27 Jul 2005 01:24:46 -0400 (EDT)
  • References: <200507260801.EAA00224@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Selina wrote:

>Dear all,
>
>I have a (possibly simple) problem interpreting the output of Solve. I am solving two nonlinear equations, and I get a list of several solutions, each of which are huge equations, which should be functions of my parameters. Anyway, I am not sure how to describe the problem but the output of Solve involves the following: #1, #1^2, .....,#1^6, along with everything else, and at the end there is an & symbol--something like "&, 2]" at the end of the second solution, "&, 6]" at the end of the 6th solution etc. What might be the reason why the output looks like this, and is there a way to convert this to a "normal" equation (without the #1's etc.)?
>
>Any help would be appreciated, thanks a lot in advance.
>
>  
>
I suspect you have a functional output in terms of Root. Look at the 
help on Root
As far as I can understand, you can get a normal equation by
First[expr][x]
where x is your variable of interest. But that probably won't solve your 
problem, just puts it back in the "normal" form.

Have you tried NSolve. It always seems to work, although you have to be 
carefull with the coefficiencts (exact vs machine) precision as I have  
learned  from many posts on this forum

Best regards
Pratik

-- 
Pratik Desai
Graduate Student
UMBC
Department of Mechanical Engineering
Phone: 410 455 8134



  • Prev by Date: Re: Showing Mathematica notebooks within Firefox browser (like Adobe PDF's)
  • Next by Date: Re: Mathematica 5.2: The 64-bit and multicore release
  • Previous by thread: solve output "problem"
  • Next by thread: Re: solve output "problem"