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FanCG1-Visitor
1-Visitor
November 29, 2010
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how to fit parameters using an implicit model equation in mathcad

The question is described as following. An model function with implict form is chosen to fit the experimental data (x,y)

unknown parameters to be fitted are a, epsilon and epsilon_A.

I dont know how to evaluate parameters with the implicit form model in mathad.

does anyone give me some suggestions?

fitting question.JPG

ViktorKorobovAnswer
1-Visitor
November 30, 2010

Look at my solution. I assume k= Boltsmann constant (?); T= Temperature, K (?).

For MINERR use option Levenberg-Marquardt.

FanCG_problem_pic.JPG

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6 replies

ViktorKorobov1-VisitorAnswer
1-Visitor
November 30, 2010

Look at my solution. I assume k= Boltsmann constant (?); T= Temperature, K (?).

For MINERR use option Levenberg-Marquardt.

FanCG_problem_pic.JPG

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FanCG1-VisitorAuthor
1-Visitor
November 30, 2010

thank you so much, viktor

and I will try to change the initial value of epsilon to a "0-close" negative value (according to its physical significance) to see whether this code can work (I forgot the T in my thread, it should be 384.15, but you have guessed the value of k and T)

I think I always have problems in using MinErr of Mathcad ( very unfamiliar with this function).

thank you again for ur great help

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