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Simple Simplex Solver is a tool function algorithms to solve equations in linear programming. its free to distribution, this tool may be useful for people. :-)
Simplex-in-PHP are PHP scripts that solve small linear programming and integer linear programming problems executing the simplex method step by step, printing the tableau and drawing the graphical analysis. Useful for students in Operational Research
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Numep is a web-based interactive program that implements some numerical algorithms such as simplex algorithm, matrix decompositions, iterational equation-system solving, eigenvalue determining.