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Optimization - Defeat reduction and control variable tolerance factors. What are they??

Posted Aug 30, 2016, 6:03 p.m. EDT Optimization, Studies & Solvers Version 5.2 0 Replies

Andrew Ryan
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I'm currently working with the optimization module in COMSOL 5.2 on mac osx, using the built in parameter estimation step. I'm using the Levenberg-Marquardt solver with the numeric gradient method, although I believe these options are available for all gradient methods in this solver.

Under the optimization solver settings window, there are two options for which I have been unable to find any documentation:

Control variable tolerance factor (default=1)

Defect reduction tolerance factor (default = 0ff, toggle on default = 1)

I can't find any mention of these in the documentation. I examined the reference noted at the end of the Levenberg-Marquardt description in the documentation but wasn't able to find a clear description there either. I have some guesses for what the control var tolerance factor is, but I have no idea what defeat reduction is. Can you provide a description or reference for these settings? Or am I just missing something in the documentation? Thanks!
0 Replies Last Post Aug 30, 2016, 6:03 p.m. EDT
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