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How to plot a semi-circle on the horizontal axis in MATLABs & How to shade half the cirlce?

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Ahmed
Ahmed 2022-12-3
回答： Voss 2022-12-5
Hello I recetly got into plotting on MATLABs and I was wondering how I could create a semi-circle on the x-axis, and shade half of the semi-cicle afterwards.

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回答（2 个）

Image Analyst
Image Analyst 2022-12-3
Voss
Voss 2022-12-5
Ran in:
Npts = 101;
r = 2;
c = [0 0];
theta = linspace(0,pi,Npts);
x = c(1) + r.*cos(theta);
y = c(2) + r.*sin(theta);
fill([x(1:(Npts+1)/2) c(1) x(1)], ...
[y(1:(Npts+1)/2) c(2) y(1)], ...
'y', ...
'EdgeColor','none')
hold on
plot([x x(1)],[y y(1)],'k','LineWidth',2)
axis equal

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