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MathGroup Archive 2005

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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>


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