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 A problem from Fitting with newfunction		  New Topic  Reply to Topic
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Brucettl

China
1 Posts
Posted - 05/09/2015 :  05:16:40 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 9
Operating System: win 7
Hello everyone here! I am seeking for help!
I used the following equations to fit my data, the fitting curve was perfect,but the result was not stable, even with differences of many magnitudes.

y=(E*x^2+F)/(x^4+G*x^2+H);
E=2*A*T+A^2;
F=2^A*T^3+A*T^2;
G=E+2*T^2;
H=T^4+F;

Is there any problem here?

SeanMao

China
288 Posts
Posted - 05/11/2015 :  02:25:55 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

I am afraid it is hard to judge what is actually going on with your fitting based on your description.

To diagnose your problem in our side, you may send your opj files along with the detailed descriptions, such as, what are the independent variables, what are the optimal initial parameter values, to tech@originlab.com.

Regards!

Sean

OriginLab Tech. Service
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