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MathGroup Archive 2005

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Re: Hold problems with FindRoot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57073] Re: Hold problems with FindRoot
  • From: Jonas Björnerstedt <lists at bjornerstedt.org>
  • Date: Sat, 14 May 2005 04:58:11 -0400 (EDT)
  • References: <428457A1.3020501@bjornerstedt.org>
  • Sender: owner-wri-mathgroup at wolfram.com

Hello again,

There was a small mistake in my previous posting. It should have said:

FindRoot[Evaluate[{f[x,y]==0, g[x,y]==0}],{{x,1},{y,1}}]

where f and g are functions that work correctly. Trying to solve one 
equation for two unknowns would cause other problems than I am currently 
having.

Jonas.

Jonas Björnerstedt wrote:

> Hello all,
>
> I have problems getting FindRoot to evaluate the equations it 
> evaluates, despite using Evaluate on the equations. I have a rather 
> complex function f[x,y] that works correctly with individual values x 
> and y. Evaluating the following expression does not work however.
>
> FindRoot[Evaluate[f[x,y]==0],{{x,1},{y,1}}]
>
> When evaluating, I get similar errors as when I evaluate f without 
> inserting values for x and y. I can also do a Plot3D on f without 
> using Evaluate.
>
> Does anybody have an idea what the problem is?
>
> Jonas
>


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