Re: refer to the result of FindRoot[ ]
- To: mathgroup at smc.vnet.net
- Subject: [mg61560] Re: refer to the result of FindRoot[ ]
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Sat, 22 Oct 2005 00:36:19 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <dja24u$fg7$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
perimeterbow at gmail.com wrote:
> FindRoot[] returns result in this format {x->2.123}, how can I get rid
> of the x-> so I can use the number directly to automate calculation
> flow?
> Thanks.
>
*FindRoot* returns a list of transformation rules. You can use/apply
them thanks to the replacement operator /. (forward slash and dot) as in
the following example:
In[1]:=
FindRoot[x^2 + 5*x + 6 == 0, {x, 1}]
Out[1]=
{x -> -2.}
In[2]:=
x /. First[%]
Out[2]=
-2.
Check
http://documents.wolfram.com/mathematica/book/section-1.4.2
Regards,
/J.M.