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 two-phase exponential curve fitting		  New Topic  Reply to Topic
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maidlvuong

France
6 Posts
Posted - 02/18/2022 :  11:55:30 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi everyone,

I want to fit a curve following this 2-phase exponential equation:

y = A1*(1 - 2exp(-x/T1)) + A2*(1 - 2exp(-x/T2)

Does anyone know how to modify the curve fitting function "ExpAsso" to do this? Do you know any alternative option?
y = A1*(1 - exp(-x/T1)) + A2*(1 - exp(-x/T2)

Origin Ver.2021 9.8.0.200 and Service Release (Select Help-->About Origin):
Operating System: Win 10 64 bit

Mai D.L. Vuong

YimingChen

1609 Posts
Posted - 02/18/2022 :  11:58:58 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You will have to define the fitting function manually. Check the tutorial page below:
https://www.originlab.com/doc/tutorials/userdef-fitfunc

James
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