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 Using constraints in nonlinear fitting		  New Topic  Reply to Topic
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Viktoriaa

2 Posts
Posted - 03/02/2021 :  12:02:34 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi everyone,

I would like to fit a curve with 4 Gausses. The width of Gauss1 and Gauss 2 should be the same, while those of Gauss3 and Gauss4 are independent.



How can I set up the constrain that three width values w1 w3 and w4 are to be fitted and w1=w2.

Under constraints option I got syntax error message.

Thank you in advance

YimingChen

1593 Posts
Posted - 03/02/2021 :  3:03:06 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
If you use Nonlinear Curve Fit tool, you can set the linear constraint as show blow. Make sure check the box to enable the constraints.


James
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Viktoriaa

2 Posts
Posted - 03/03/2021 :  01:10:02 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you very much for your reply. The error was that I wrote "w_2" instead of "w__2". Now the fitting works as I would like to :-)
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