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aianni

Italy
1 Posts
Posted - 07/14/2004 :  06:34:06 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic

Dear All
I have been trying to understand whether using Origin one can
write his/her own log-likelihood and minimize it. This problem is
important because in some low-counting experimets one does not want
to use the standard chi-square procedure. I understand that in Origin
non-linear minimization is treated with a pre-defined chi-square procedure and I have not seen the possibility to call within a file.c
a minimization algorithm.
Is anyone an idea how to deal with this problem?

Best Regards
Aldo

easwar

USA
1964 Posts
Posted - 07/14/2004 :  12:03:02 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Aldo,

Origin currently supports Simplex and Levenberg-Marquardt minimization, and does not offer the log-likelihood method.

It is not currently possible to replace the internal minimization methods used in the NLSF tool with your own routines (if that is what you were asking about).

If you have C code that does minimization using log-likelihood, you can try porting that to Origin C and then calling the OC function to perform the minimization, or create a DLL with external code that does minimization and call the DLL from Origin/OriginC.


Easwar
OriginLab
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