Calling the LP Solve linear program software from Excel, S-Plus and R
Buttrey, Samuel E.
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We present software that allows Excel, S-Plus and R to call the functions in the lp solve system. Lp solve is free software (licensed under the Gnu Lesser GPL) that solves linear and mixed-integer linear programs of moderate size (on the order of 10,000 variables and 50,000 constraints). Since these problems are substantially larger than those that can be handled by Excel's built-in solver, this link will allow Excel users to handle large problems at no extra cost.