Re: refer to the result of FindRoot[ ]
- To: mathgroup at smc.vnet.net
- Subject: [mg61551] Re: refer to the result of FindRoot[ ]
- From: Dave Seaman <dseaman at no.such.host>
- Date: Sat, 22 Oct 2005 00:35:48 -0400 (EDT)
- Organization: Information Technology at Purdue
- References: <dja24u$fg7$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
On Fri, 21 Oct 2005 06:34:06 +0000 (UTC), 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.
Use the operator "/." to perform the substitution. For example, let's say you
want to evaluate 1-x^2/2+x^4/24, given that x is a root of the equation
"x==Cos[x]":
In[1]:= sol=FindRoot[x==Cos[x],{x,1}]
Out[1]= {x -> 0.739085}
In[2]:= 1-x^2/2+x^4/24 /. sol
Out[2]= 0.739309
--
Dave Seaman
Judge Yohn's mistakes revealed in Mumia Abu-Jamal ruling.
<http://www.commoncouragepress.com/index.cfm?action=book&bookid=228>