Curve fitter, how to start?
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Hi, I just imported curve fitter to the my MATLAB. I have these coordinates from the xls file , and I wish to import them directly in curve fitter. But that doesn't open it. Can this be done easily?
Any help appreciated
Thanks
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Star Strider
2024-2-26
Try this —
T1 = readtable('data.xlsx');
Var1 = str2double(cellfun(@(x)regexp(x, '\d*', 'match'), T1.Var1));
T1 = removevars(T1,'Var1');
T1 = addvars(T1, Var1, 'Before','Var2')
fitf1 = fit(T1.Var1, T1.Var2, 'poly1')
figure
plot(fitf1, T1.Var1, T1.Var2)
grid
fitf2 = fit(T1.Var1, T1.Var2, 'poly2')
figure
plot(fitf2, T1.Var1, T1.Var2)
grid
.
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Star Strider
2024-2-26
As always, my pleasure!
Not all the estimated parameters in the exponential or power functions were significantly different from zero (the confidence limits have opposite signs) so I only posted the models with significant parameters. (I tried several different models with 3 or fewer parameters, since there are only 4 data points, only models with 3 or fewer paramters will give reliable results in this instance.)
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