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Dear All, I am looking for C or C++ code for multivariate nonlinear least squares optimisation. Ideally, it would satisfy these conditions: 1. allow user-defined C/C++ code for the function to be optimised 2. require at most first partials 3. allow linear constraints 4. cost nothing 5. comply to ANSI or be proven to run on Solaris 2.x If you have a favourite that comes close to satisfying these, I'd love to hear about it. Regards, Miro Powojowski %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%