how to plot polyfit same plot as scatter

2021 4 17
1 个回答
更新时间：2021 4 17
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figure (1)
scatter(Alpha(X_new),CD_new,'linewidth',0.0001);
p=polyfit(Alpha(X_new),CD_new,1);
xlabel('Alpha');
ylabel('CD');

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回答（1 个）

Cris LaPierre
Cris LaPierre 2021-4-17
Ran in:

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Ran in:
Look at some of the examples on the polyval documentation page.
Polyfit just returns the coefficient values. If you want to plot it, you need to evaluate your polynomial, and then plot the resulting values using plot.
x = linspace(0,4*pi,10);
y = sin(x);
p = polyfit(x,y,7);
% evaluate polynomial
x1 = linspace(0,4*pi);
y1 = polyval(p,x1);
% plot
scatter(x,y)
hold on
plot(x1,y1)
hold off
legend('Data','Polyfit')

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