Renaming Fit rsquare value

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

Answer 1

[Scott MacKenzie]

ft1=fittype('m*x+b');
[Fit1,gof]=fit(A',T',ft1)

R1 = gof.rsquare

[Petch Anuwutthinawin]

I happen to have multiple of these functions, how do I make it only take the rsquare of Fit1?

[Scott MacKenzie]

Sorry, I don't understand. The R-squared value is the rsquared field of the gof structure returned by fit. Just rename it as I demonstrated, and repeat as often as you call fit. Perhaps demonstrate the issue you are concerned with in code.

[Petch Anuwutthinawin]

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]

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