I would like to announce the release of TNC v 1.2. TNC is a non-linear, bound constrained optimizer written in C with a Python interface. You can get it at: http://www.jeannot.org/~js/code/tnc-1.2.tgz The latest version is always available at: http://www.jeannot.org/~js/code/index.en.html An example and a few test cases are provided. Thanks, Jean-Sebastien Example use: import tnc # A function to minimize # Must return a tuple with the function value and the gradient # (as a list) or None to abort the minimization def function(x): f = x[0]**2+abs(x[1])**3 g = [2*x[0], 3*abs(x[1])*x[1]] return f, g # Optimizer call rc, nf, x = tnc.minimize(function, x = [-7, 3], low = [-10, 1], up = [10, 10]) print "After", nf, "function evaluations, TNC returned:", tnc.RCSTRINGS[rc] print "x =", x print "exact value = [0, 1]"