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Re: solve output "problem"
*To*: mathgroup at smc.vnet.net
*Subject*: [mg59066] Re: solve output "problem"
*From*: Peter Pein <petsie at dordos.net>
*Date*: Thu, 28 Jul 2005 02:26:12 -0400 (EDT)
*References*: <200507260801.EAA00224@smc.vnet.net> <dc76fj$jrc$1@smc.vnet.net>
*Sender*: owner-wri-mathgroup at wolfram.com
Pratik Desai schrieb:
> Selina wrote:
>
>
>>Dear all,
>>
>>I have a (possibly simple) problem interpreting the output of Solve. I am solving two nonlinear equations, and I get a list of several solutions, each of which are huge equations, which should be functions of my parameters. Anyway, I am not sure how to describe the problem but the output of Solve involves the following: #1, #1^2, .....,#1^6, along with everything else, and at the end there is an & symbol--something like "&, 2]" at the end of the second solution, "&, 6]" at the end of the 6th solution etc. What might be the reason why the output looks like this, and is there a way to convert this to a "normal" equation (without the #1's etc.)?
>>
>>Any help would be appreciated, thanks a lot in advance.
>>
>>
>>
>
> I suspect you have a functional output in terms of Root. Look at the
> help on Root
> As far as I can understand, you can get a normal equation by
> First[expr][x]
> where x is your variable of interest. But that probably won't solve your
> problem, just puts it back in the "normal" form.
>
> ...
> Best regards
> Pratik
>
Not really... First[Root[f,index]][x] evaluates to f[x] which brings you
back to "the root of your problem" ;-), which is f[x]==0. It does _not_
in any way 'normalize' the roots.
--
Peter Pein
Berlin
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