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Now 4 Spice-Engines under one umbrella or simply "buy to die"
A good overview about current developments is here:
http://www-num.math.uni-wuppertal.de/Lectures/Sptop_ws07/Lecture10.pptBut the key to efficient multirate partioning is the right equations setup. The best would be the tableau approach instead of modified nodal because then the jacobian is much more sparese and near diagonal. That enable a more time independ multirate partioning.