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 Entering a function. Need Help		  New Topic  Reply to Topic
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ahmet7753

Turkey
1 Posts
Posted - 12/24/2015 :  4:51:27 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi, I'm using originlab 2016.

Here is my datas and the graph.

I have a formula and it's a+(b*T)+(c*T^2)

It's thermodynamics formula.

I will give the values of a,b,c to the function but I need to use x values that placed in graph X-axis as T.

How can I do that?

Shirley_GZ

China
Posts
Posted - 12/25/2015 :  01:05:15 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

You can define a user-defined function and then use it to do a linear curve fitting.

When you do fitting, you can give initial values for these three parameters.

See details in the tutorials below:
http://www.originlab.com/doc/Tutorials/Fitting-NLFit-Basic
http://www.originlab.com/doc/Tutorials/UserDef-FitFunc

If any problem, please let me know.

Thanks,
Shirley


Originlab Technical Service Team
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