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ptc-29304621-Visitor
1-Visitor
October 31, 2014
Solved

parameter constraints with genfit?

  • October 31, 2014
  • 3 replies
  • 2922 views

Is it possible to include parameter constraints when using genfit? If so, how is it implemented?

I need to fit a non-linear equation (Richards function) and genfit crashes with the current setting. I supply all the derivative functions with respect to the parameters.

Any insight is greatly appreciated.

Ulrich Hopfer

Best answer by ptc-2930462

Genfit only uses the derivatives with respect to the fitted parameters. I looked up the algorithm for the Levenberg-Marquardt method for non-linearized fitting.

3 replies

M
MikeArmstrong1-Visitor
1-Visitor
October 31, 2014

I would suggest posting a worksheet.

P
ptc-29304621-VisitorAuthor
1-Visitor
October 31, 2014

I have added the worksheet to my question on constrains with genfit, as suggested by Mike.

Ulrich

M
MikeArmstrong1-Visitor
1-Visitor
October 31, 2014

You forgot to upload the data

W
Werner_E25-Diamond I
25-Diamond I
October 31, 2014

Yet another thread which is more than one hour old and did show up for me 15 minutes ago. Looks like its getting worse.

P
ptc-29304621-VisitorAuthorAnswer
1-Visitor
November 3, 2014

Genfit only uses the derivatives with respect to the fitted parameters. I looked up the algorithm for the Levenberg-Marquardt method for non-linearized fitting.

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