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 Fitting a system of equations
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mmcb1234

USA
1 Posts

Posted - 07/26/2013 :  1:53:21 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Operating System:

Hello,

I am using origin 8.6 and am trying to fit to a complicated system of equations that is only able to be solved numerically.

For example I have an equation to fit:

I = A*X + B*Y

where:

X^2 + (Y - R - L - K1)*X + (R - Y)*L = 0

Y^2 + (2*X-2*R)*Y +(X^2 -2*R*X) = 0

Y is the dependent variable,
L is the independent variable,
and R,K1,K2,A, and B are constants, some of which are fixed.

Is it possible to fit this system of equations without solving them explicitly? How would I go about this?

Thanks for the help!

meili_yang

103 Posts

Posted - 07/26/2013 :  4:31:52 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Nonlinear Implicit Curve Fitting is OriginPro only. Please copy the whole link to your browser.

http://www.originlab.com/www/helponline/Origin/en/UserGuide/Nonlinear_Implicit_Curve_Fitting_ OriginPro_Only .html

You might try OriginPro Evaluation from here:
http://www.originlab.com/index.aspx?go=DOWNLOADS/OriginEvaluation

Regards,

Meili
OriginLab Tech Support
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