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Curve fit the given data set with an appropriate polynomial function

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johnmurdock
johnmurdock 2019-4-8
clear
clc
A=xlsread('Data.xls');
t=A(:,1);
y=A(:,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
Given this code, how would I include a plot of an appropriate polynomial fit from the excel document labeled "Data.xls"

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