Re: General--Using FindRoot

*To*: mathgroup at smc.vnet.net*Subject*: [mg69081] Re: General--Using FindRoot*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Wed, 30 Aug 2006 06:32:03 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <ed0s79$sqk$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

batman_forever at email.it wrote: > after using the command Findroot to find the approssimate solution, I have to use this number for other steps. > the solution is k --> 0.12657 > how I can define automatically a variable k2 = 0.12657 so I can insert this in another expression? Use the replacement operator since FindRoot returns a list of replacement rules: sol = FindRoot[Sin[k] == Cos[k], {k, 1}] --> {k -> 0.7853981633974483} k2 = k /. sol --> 0.7853981633974483 k2 = k /. FindRoot[Sin[k] == Cos[k], {k, 1}] --> 0.7853981633974483 HTH, Jean-Marc