R help - Jan 2010 - using optim

Dear R People:

I know that you can use "optim" for a function with several
parameters.

Is there an equivalent for 2 functions, please?  Or should I put
together a finite difference type of matrix, etc., please?

Thanks,
Happy New Year,
Erin


-- 
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com

On 01/01/2010 11:45 PM, Erin Hodgess wrote:
> Dear R People:
> 
> I know that you can use "optim" for a function with several
parameters.
> 
> Is there an equivalent for 2 functions, please?  Or should I put
> together a finite difference type of matrix, etc., please?
What is the goal?  optim optimizes a scalar value.  If you have a length 
2 vector to "optimize", what does that mean?

Duncan Murdoch
> 
> Thanks,
> Happy New Year,
> Erin
> 
>

Duncan Murdoch wrote:
> On 01/01/2010 11:45 PM, Erin Hodgess wrote:
>> Dear R People:
>>
>> I know that you can use "optim" for a function with several
parameters.
>>
>> Is there an equivalent for 2 functions, please?  Or should I put
>> together a finite difference type of matrix, etc., please?
> 
> What is the goal?  optim optimizes a scalar value.  If you have a length 
> 2 vector to "optimize", what does that mean?
Just a guess: If you want to optimize a 2 dim vector, you are probably 
doing some multi criterial optimization and you are looking for pareto 
optimality, right?

In that case, you might be interested in package "mco" for "Multi
criteria optimization algorithms and related functions"

Best wishes,
Uwe

> Duncan Murdoch
> 
>>
>> Thanks,
>> Happy New Year,
>> Erin
>>
>>
> 
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