Here you can minimize a non-linear function f(z) of n variables z1,z2.... using simplex method. This does not use the derivative of the objective function. Please use the specific format to input various math functions.You may want use the random search method to get a good initial guess for this method.
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If you would like to have a free stand-alone Windows application for simplex method in 2 dimensions, send e-mail to firstname.lastname@example.org