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 nonlinear fitting constraint		  New Topic  Reply to Topic
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NickChang

Taiwan
1 Posts
Posted - 01/05/2023 :  03:23:15 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System: How to set the nonlinear constraint in nonlinear curve fitting? for example:y=(a1*b1+a2*b2*x^2)/(a1*b1) nonlinear constraint:as x=0 a1*b1=2.I don't know whether this kind of operation can be done in Origin?

YimingChen

1651 Posts
Posted - 01/05/2023 :  08:49:40 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Origin doesn't support nonlinear constraints. But in this case, can you simply replace b1 with 2/a1 in the fitting function?

James
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aplotnikov

Germany
169 Posts
Posted - 01/05/2023 :  11:24:42 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You cannot estimate paired values (a_i, b_i) where i={1,2} separately using the given formula.
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