How do I add a curve fitted plot to this code?

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0 个投票

clc 
clear 
close all
xls=xlsread("Exam2_Data.xls"); 
t=xls(:,1); 
y=xls(:,2); 
SST=sum((y-mean(y)).^2); 
for i=1:3
fprintf('For %d order fit\n\n',i);
disp('Polynomial coefficients are');
C=polyfit(t,y,i);
SSR=sum((y-polyval(C,t)).^2);
R2=1-SSR/SST;
fprintf('R^2 is %f\n\n',R2);
end
for i=2:length(t)-1
T=[t(i-1) t(i) t(i+1)];
Y=[y(i-1) y(i) y(i+1)];
  
if(t(i)<33.75&&t(i+1)>33.75)
C=polyfit(T,Y,2);
disp('Value at 33.75 is ');
polyval(C,33.75)
return
end
end

2 个评论
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Rik 2019-4-9

Do you mean like in a live script? Also, are you sure about the return? Don't you mean break? Return causes the current running function to return to the caller, while break causes the current (inner) loop to exit.

johnmurdock 2019-4-9

I mean I want to add a block of code that plots a curve fitted line with an equation over the data I pulled from excel. I will try break instead of return as well.

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