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parameter constraints with genfit?

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parameter constraints with genfit?

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

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Re: parameter constraints with genfit?

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.

View solution in original post

6 REPLIES 6

Re: parameter constraints with genfit?

I would suggest posting a worksheet.

Re: parameter constraints with genfit?

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

Ulrich

Re: parameter constraints with genfit?

You forgot to upload the data

Re: parameter constraints with genfit?

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

Re: parameter constraints with genfit?

It seems to be worse tonight. Maybe PTC are playing tricks on us :-).

Re: parameter constraints with genfit?

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.

View solution in original post