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constraint optimization: solving large scale general nonlinear problems

Hi

I need advice regarding constraint optimization with large number of
variables. 

I need to solve the following problem

   max      f(x1,...,xn)
  x1,..xn
  
    x1=g1(x1,...,xn)
    .
    .
    xn=gn(x1,...,xn) 

I am using Rdonlp2  package which works well until 40 variables in my
case. I need to solve this problem with over 300 variables. In this case
Rdonlp2 is very  very slowly. I know that in Matlab exists  Knitro
(http://www.ziena.com/knitro.htm.) for large optimization problems.

It will be great if you can suggest me some alternatives solutions.


Thanks in advance,
Florin