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helporigin8

32 Posts
Posted - 09/09/2025 :  07:57:39 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Is there any way to say to the program that Y (Area/Nbeam) cannot be smaller than 0?

YimingChen

1691 Posts
Posted - 09/09/2025 :  09:08:39 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Could you share your project here? It's strange because, according to the definition of your fitting function, y should always be greater than zero. Have you manually changed the y-axis tick labels? Thank you.

Yiming
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helporigin8

32 Posts
Posted - 09/11/2025 :  06:05:45 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
No, I did not change it manually.
Attached is the project.https://my.originlab.com/ftp/forum_and_kbase/Images/F19%20beam%20on%20Pd%20targets_Avgust_2025.opju

Thank you.
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YimingChen

1691 Posts
Posted - 09/12/2025 :  09:57:49 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Maybe you can set a bound to parameter C to be >=0. See below:



Yiming
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helporigin8

32 Posts
Posted - 09/16/2025 :  06:01:34 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
The parameter C was already positive in my fit.
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YimingChen

1691 Posts
Posted - 09/16/2025 :  12:01:53 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Could you share your fitting function file with me? When I recreated your fitting function and reran the fitting without parameter constraints, I got a negative C value. See below.



Yiming
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