polynomial regression of a given function

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Anas Gharsa
Anas Gharsa 2022-1-25
评论： Anas Gharsa 2022-1-25
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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采纳的回答

Jon
Jon 2022-1-25
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,'-')
  1 个评论
Anas Gharsa
Anas Gharsa 2022-1-25
Yes that's right!! i intend to enter the x values in increasing order!!! Thank you so much this is so helpful

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