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 Multi-exponential fitting?		  New Topic  Reply to Topic
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AOjuva

11 Posts
Posted - 03/03/2020 :  03:05:07 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 2020
Operating System: Windows 10

I'm trying to model a signal from a chemical polymerization reaction. The signal resembles an exponential growth function, but a single function does not fit all data. I suspect that, since the reaction has several steps (monomer->dimer->oligomer->polymer->cross-bridging), I need to use a multi-exponential function to model it entirely.

Not being too familiar with Origin's function builder, I'd appreciate some hands-on help on how to define a function to be fitted.

The function should be of type:
f(x)=a1*exp(b1*x)+a2*exp(b2*x)+...

Thanks in advance!

AmandaLu

439 Posts
Posted - 03/03/2020 :  04:00:27 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Here is a simple example:

https://www.originlab.com/doc/Tutorials/UserDef-FitFunc

Here is detailed document of Fitting Function Builder:

https://www.originlab.com/doc/Origin-Help/FitFunc-Builder

Thanks,
Amanda
OriginLab Technical Service
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