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 how to run a non-linear fit for a user-defined equ		  New Topic  Reply to Topic
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rahulpatwa23

India
3 Posts
Posted - 09/28/2017 :  08:36:47 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8.5
Operating System:Windows 7
E= U^* T^2/(T-T_∞ )^2 +K_g R (〖T_m^0〗^2-T^2-T_m^0 T)/((T_m^0-T)^2 T)

I have written the equation.
Please tell me the steps I have no mathematical background.
I have values for E and T

I want to calculate U* and Kg, I know values of Tinf and Tm0.

Please help.

RAHULPATWA
Edited by - rahulpatwa23 on 09/28/2017 08:38:41 AM

arstern

USA
237 Posts
Posted - 09/28/2017 :  09:09:35 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Please see tutorial on creating a user-defined equation:

http://www.originlab.com/doc/Tutorials/Fitting-NLFit-Basic

You will input U and Kg as parameters since you do not know these values, and input Tinf and Tm0 as constants. Input E as the dependent variable and T as the independent variable.

Thanks
Aviel
OriginLab
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rahulpatwa23

India
3 Posts
Posted - 09/28/2017 :  09:43:23 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Sir,

I am unable to understand the terminology.
Is it possible to share the data set and equation and you help me with it.

Regards,
Rahul
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arstern

USA
237 Posts
Posted - 09/28/2017 :  11:35:12 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Sure, please post a screenshot of your data. I can then reply by posting step by step instructions with using screenshot images.

-Aviel
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