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MathGroup Archive 2001

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Re: FindRoot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31488] Re: FindRoot
  • From: Erk Jensen <Erk.Jensen at cern.ch>
  • Date: Thu, 8 Nov 2001 04:54:26 -0500 (EST)
  • Organization: CERN http://www.cern.ch
  • References: <9sb3u5$8oc$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Pieter-Jan.DeSmet at fys.kuleuven.ac.be wrote:
> 
> Dear Sir,
> 
> Can you clarify the following error message?
> 
> In[3]:= f[i_] := x == i
> 
> In[5]:= FindRoot[f[1], {x, 0}]
> 
> FindRoot::frnum: Function {False} is not a length 1 list of
> numbers at {x} = {0.}.
> 
> Out[5]=FindRoot[f[1], {x, 0}]
> 
> This is a simplified version of an error message I got in a more
> difficult case. I hope that I have not made a stupid mistake.
> 
> Thank you very much
> 
> Pieter-Jan De Smet

Try FindRoot[Evaluate[f[1]],{x,0}]

Ciao
  -erk-
-- 
 Dr.-Ing. Erk JENSEN                    mailto:Erk.Jensen at cern.ch
 CERN  PS/RF  L19510                    http://cern.ch/Erk.Jensen
 CH-1211 Geneva 23                      Tel.:     +41 22 76 74298
 Switzerland                            Fax.:     +41 22 76 78510


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