How to plot a semi-circle?

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

 采纳的回答

theta = 0:.01:pi;
y = 500*exp(1j*theta);
plot(real(y),imag(y));
axis([-750 750 -750 750]);
grid on;

4 个评论

Thanks, but what if I want to slant the semicircle by 30 degree? is it possible?
theta = (0:.01:pi)+30*pi/180;
Thanks,If I want to shift the origin from (0,0) to (100,100)? Which command must I use?
This is very useful. I tried this but the semicircle is upsidedown and shifted. How can I change the code?

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