How to plot left semi_circle in matlab? (Given, x(origin), y(origin) and r(radius) of the circle)?

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Bishwam Pattnaik
Bishwam Pattnaik 2020-3-18
回答： Image Analyst 2020-3-19
I was just wandering how to plot left semi circle. given x,y and radius of the circle.
For example, x=5, y=10, r=3

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Adam Danz
Adam Danz 2020-3-18
编辑：Adam Danz 2020-3-19
How to plot left semi circle:
The key is to compute theta values between pi/2 and 3*pi/2.
x=5;
y=10;
r=3;
theta = linspace(pi/2, 3*pi/2, 100); % <-- left half of circle
xCirc = r * cos(theta) + x;
yCirc = r * sin(theta) + y;
cla()
plot(xCirc, yCirc)
axis equal
grid on
xline(x)
yline(y)

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Image Analyst
Image Analyst 2020-3-19

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