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help with regression fitting - curvilinear

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Eric Escoto
Eric Escoto 2021-10-4
评论： Eric Escoto 2021-10-4
I lost on why the model cant plot a single line after fitting a regression to the data (example data attached).
I'm using,
p = polyfit(data(:,2), data:,1), 2);
ypoly = poly val(p, data(:,2));
figure
plot(data(:,2), data(:,1), 'o')
hold on
plot(data(:,2), ypoly)
The figure looks like this (attached) with lines all over instead of one smooth curve.

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采纳的回答

KSSV
KSSV 2021-10-4
编辑：KSSV 2021-10-4
load('data.mat')
p = polyfit(data(:,2), data(:,1), 2);
xi = linspace(min(data(:,1)),max(data(:,2)),1000) ;
yi = polyval(p, xi);
figure
plot(data(:,2), data(:,1), 'o')
hold on
plot(xi,yi)
You made some syntax errors in the given code. Check with the given code.

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