Renaming Fit rsquare value

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Petch Anuwutthinawin
评论： Scott MacKenzie 2021-6-26
I have made a fit for a set of data. It returns an rsquare value, which I have to rename to R1.
%This is the code for the fit
ft1=fittype('m*x+b');
[Fit1,gof]=fit(A',T',ft1)
%Below is the output for gof. I need to rename rsquare to R1.
gof =
struct with fields:
sse: 2.1928e+03
rsquare: 0.0121
dfe: 8
adjrsquare: -0.1114
rmse: 16.5561

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Scott MacKenzie
Scott MacKenzie 2021-6-26
ft1=fittype('m*x+b');
[Fit1,gof]=fit(A',T',ft1)
R1 = gof.rsquare
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Petch Anuwutthinawin
Petch Anuwutthinawin 2021-6-26
I have multiple fits made, and have to rename each rsquare output from each fit with a different name.
ft1=fittype('m*x+b');
[Fit1,gof]=fit(A',T',ft1)
%% Second order poly
ft2=fittype('a*x.^2+b*x+c');
[Fit2,gof]=fit(A',T',ft2)
%% Third order poly
ft3=fittype('a*x.^3+b*x.^2+c*x+d');
[Fit3,gof]=fit(A',T',ft3)
%The rsquare for Fit1 has to be named R1, the rsquare for Fit2 has to be
%named R2 etc.
Scott MacKenzie
Scott MacKenzie 2021-6-26
I notice that you are not renaming the gof variable returned in each call to fit. So, after the second call, you no longer have gof from the first call. That's fine, but if you want to have all three R-squared values after the three calls to fit, you need to save them in some way. Here's one approach:
ft1=fittype('m*x+b');
[Fit1,gof]=fit(A',T',ft1)
R1 = gof.rsquare; % save 1st R-squared value
%% Second order poly
ft2=fittype('a*x.^2+b*x+c');
[Fit2,gof]=fit(A',T',ft2)
R2 = gof.square; % save 2nd R-squared value
%% Third order poly
ft3=fittype('a*x.^3+b*x.^2+c*x+d');
[Fit3,gof]=fit(A',T',ft3)
R3 = gof.rsquare; % save 3rd R-squared value

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