Does anybody know of a R package to solve mixed-integer quadratic  
optimisations with constraints?

Alternatively is anybody working with an R interface to ILOG CPLEX  
which seems to be the 'best' commercial product in this area?

Finally, is there any relationship between the R-project and AMPL - a  
modelling language for mathematical programming <www.ampl.com> -  
which also originated in Bell Labs?

Regards,

John Marsland
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