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MathGroup Archive 2001

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Re: lists w/o double brackets

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31445] Re: lists w/o double brackets
  • From: Erk Jensen <Erk.Jensen at cern.ch>
  • Date: Wed, 7 Nov 2001 05:29:02 -0500 (EST)
  • References: <9s5jmh$4lo$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Gavin K Brennen wrote:
> 
> Hello,
> 
> I am using the function FindRoot with a large number of simultaneous equations.
> 
>         FindRoot[eqs,initialvals]
> 
> I have a function for generating the equations which works fine as a list
> input in FindRoot, however I am having difficulty creating a function for
> generating initialvals that will be accepted by FindRoot.  The problem
> seems to be that FindRoot demands a format
> 
>         FindRoot[{eq1,eq2,...,eqn},{var1,val1},{var2,val2},...,{varn,valn}]
> 
> the variables and initial values of which must appear as a list without
> double brackets.  The function I have for generating the initial values
> always outputs the list as follows
> 
>         Input
>                 initialvals
>         Output
>                 {{var1,val1},{var2,val2},...,{varn,valn}}.
> 

eqns = {{eq1, eq2,...,eqn}}
initialvals = {{var1, val1},{var2, val2},...,{varn, valn}}
MapThread[FindRoot, Join[eqns, initialvals], 0]

Ciao
     -erk-


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