I'd be interested in seeing a solution to this as well. How do you add in extra constraints for a transportation problem? All that is given in the lpsolve documentation is how to solve the most basic transportation problem. -- View this message in context: http://r.789695.n4.nabble.com/help-with-multi-objective-program-using-lpSolve-API-tp858271p3751748.html Sent from the R help mailing list archive at Nabble.com.