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Re: ?

• To: mathgroup at smc.vnet.net
• Subject: [mg120815] Re: ?
• From: Jacopo Bertolotti <jacopo.bertolotti at gmail.com>
• Date: Thu, 11 Aug 2011 05:13:16 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <201108101047.GAA26230@smc.vnet.net>

Try
FindRoot[x + 9, {x, -5}][[1, 2]]

(Part is a "normal" operation on lists)

Jacopo

On 08/10/2011 12:47 PM, David Kirkby wrote:
> The output of FindRoot[] when trying to find a root is like:
>
> {x ->  0.49454545}
>
> How can I convert that list, into the number 0.49454545?
>
> In[1]:= FindRoot[x+9,{x,-5}]
>
> Out[1]= {x ->  -9.}
>
> In[2]:= Head[%]
>
> Out[2]= List
>
> I can't seem to find any "normal" operations on the list which give me
> the number.
>
> Dave
>
>

• References:
  • How do I get a numeric value from FindRoot[] ?
    • From: David Kirkby <david.kirkby@onetel.net>