polynomial regression of a given function
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Anas Gharsa
el 25 de En. de 2022
Comentada: Anas Gharsa
el 25 de En. de 2022
i am trying to write a function which produces the regression polynomial of degree 2 for a given datapoints (x and f(x) where f is the function to be approximated). this is what i wrote !! the code gives me 0 errors but i can not plot the results for some reasons that i dont know
x=input('Enter the x coordinates');
y=input('Enter the y coordinates');
n=input('Enter the order of the polynomial');
coeff=polyfit(x,y,n);
p = polyfit(x,y,n);
plot p;
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Jon
el 25 de En. de 2022
You only solved for the coefficients. If you want to compare the original data and the fit you can do something like this, after your code above (I assume the x values are entered in increasing order)
xfit = linspace(x(1),x(end))
yfit = polyval(p,xfit);
plot(x,y,'o',xfit,yfit,'-')
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