Hi, a useful feature for *any* iterative algorithm would be the possibility to call a "monitor" at the end of each iteration. What would this monitor do would pretty much depend on the user's mood: periodically backup the state of the algorithm (in order to restart it in case of a crash), log a set of tabulated values (to plot the convergence of the algorithm), ... The idea would be to come up with a design as general as possible. Gilles proposed (see MATH-581) to use java.util.Observable. This sounds very attractive to me. Any comments? Best regards, Sebastien
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