How to track the progress of Levenberg-Marquardt

Hi all

My Levenberg-Marquardt works perfectly, but one iteration takes quite long, about 5 seconds, as expected from the complexity of my problem (~ 50 parameters fit).

Question: How to display the current number of interaction in the main program, for the user to know that it is still ongoing?

(My solution so far is to put a probe in the Levenberg-Marquardt subroutine provided on this 'i', which is the current interation. "But it's not easy to use).

Thanks & best regards!

Peter, LMU Munich, Germany

You can use your model VI to increment a counter that appears elsewhere. If your model compute partial derivatives, then there will be only one call per iteration LM model VI plus 1 for the estimate.  If you are not calculating the partial derivatives LM then uses central difference method to calculate them.  This means function by iteration of LM 3 calls, plus 3 for the estimate.

-Jim

Tags: NI Software

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