Hysteretic optimization, faster and simpler

Hysteretic optimization is a recently proposed heuristic optimization method inspired by the demagnetization of magnetic materials by an alternating external field of decreasing amplitude. So far the method has been implemented by changing the field very slowly. Here we show that changing the field very fast is often more effective. We also introduce an external field of the form different from the one applied before, which makes the application of the algorithm as a general-purpose optimizer simpler.