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How to plot a semi-circle?

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Casey
Casey 2012-2-6
评论： Elisabetta Di Franco 2022-7-26
How to plot a semi-circle and if I want just the curve of of the semi-circle and the radius of the circle is 500m?
Thanks

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Wayne King
Wayne King 2012-2-6
theta = 0:.01:pi;
y = 500*exp(1j*theta);
plot(real(y),imag(y));
axis([-750 750 -750 750]);
grid on;
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Casey
Casey 2012-2-8
Thanks,If I want to shift the origin from (0,0) to (100,100)? Which command must I use?
Elisabetta Di Franco
Elisabetta Di Franco 2022-7-26
This is very useful. I tried this but the semicircle is upsidedown and shifted. How can I change the code?

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