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 Output the XYY fitted curve		  New Topic  Reply to Topic
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goulven999

Japan
3 Posts
Posted - 03/01/2018 :  10:01:28 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release: 9.0.0 (32bit)
Operating System: windows

My model use a complex equation and use the real part as y1 and the imaginary part as y2 for my fitting.

complex cc =Xadia+Xiso1/((1+(1i*2*pi*x*Tau1)^(1-Alpha1))^(Beta1));
y1 = cc.m_re;
y2 = -cc.m_im;

I can successfully fit a XYY dataset with the nlbeginr/nlfit/nlend
and obtain the fitting parameter.

My problem is to obtain the fitted curve.
Using the

fity=fit(fitx);

I can obtain the y1 value, and extract it to a new sheet, but I don't know how to obtain the y2 value.

Thank you

yuki_wu

896 Posts
Posted - 03/05/2018 :  02:52:15 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

You can get the fitted curve of y2 by specifying the index, for example:

fity2 = fit(fitx, 2);

Please refer to this example:
https://www.originlab.com/doc/LabTalk/ref/Fit-func

Hope it helps.

Regards,
Yuki
OriginLab
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goulven999

Japan
3 Posts
Posted - 03/05/2018 :  06:41:58 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks for your help

I tried it but I get some error of range declaration.

I find an other solution:
first I generate the x value in a logarithm scale, then recalculate the imaginary and real part with the parameter obtain from the fitting. It work very well and I can control the lowest and highest X, as well as the number of point

csetvalue col:=Col(1) formula:=(10^((data(0, 1, 0.005))*7)/100);
csetvalue col:=col(2) formula:="imreal(Xadia+Xiso1/((1+(1i*2*pi*Col(1)*Tau1)^(1-Alpha1))^(Beta1))";
csetvalue col:=col(3) formula:="-imaginary(Xadia+Xiso1/((1+(1i*2*pi*Col(1)*Tau1)^(1-Alpha1))^(Beta1))";

Regards
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