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MathGroup Archive 2001

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RE: FindRoot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31508] RE: [mg31463] FindRoot
  • From: "David Park" <djmp at earthlink.net>
  • Date: Thu, 8 Nov 2001 04:55:34 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Check the Attributes of FindRoot.

Attributes[FindRoot]
{HoldAll, Protected}

f[i_] := x == i
FindRoot[f[1] // Evaluate, {x, 0}]
{x -> 1.}

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/ 

> From: Pieter-Jan.DeSmet at fys.kuleuven.ac.be
To: mathgroup at smc.vnet.net
> [mailto:Pieter-Jan.DeSmet at fys.kuleuven.ac.be]
> 
> 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
>


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