[Couenne] Numerical non-linear solver

[Matthew Milner]

Dear All,

I am working for Andrew Mason at the University of Auckland and we are
attempting to get a non-linear solver working with our models. However they
are all just stored on excel spreadsheets and as such we do not have any
derivative information. We are looking for a solver that will numerically
step through for a solution while passing it the new values calculated on
the spreadsheet.
Is this possible through Couenne and how could we do this? Or is there any
other non-linear solvers you could recommend?

Regards,
Matt
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