I have this code to linear fit data
x = 1:10; y1 = [1 5 7 8 9 15 16 12 18 20]; scatter(x,y1,'b','*') P = polyfit(x,y1,1); slope = P(1) intercept = P(2) yfit = P(1)*x+P(2); % P(1) is the slope and P(2) is the intercept
hold on; plot(x,yfit,'r-.')And the figure I got from code is attached here
The intercept from figure should be 2.2. But I get the value from code is 0.5.
I didn't understand why the values are different? The code seems correct to me. Any suggestion from anyone?
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