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Peter Thanks for the response.  I only saw it today.  I still have no success.  I changed the component to SignalCurrent, but keep getting the message: WSMSimulate::invu: The inputs {u} were not recognized. Irrespective of the function I...
Simply typing "particle filter Mathematica" into Google gave me the following very good results: http://library.wolfram.com/infocenter/MathSource/7188/ ...