MATLAB: How to plot a disc with a given center c and radius r

circlefaq

Hi friends,

how can i draw a disc which is centered at (x0,y0), which has radius r and which is filled by color c, the circle should be colored in black.

Best Answer

You can use this answer:

http://www.mathworks.com/matlabcentral/answers/98665-how-do-i-plot-a-circle-with-a-given-radius-and-center

But instead of using h = plot(xunit, yunit); use h=fill(xunit,yunit,'k') instead.

The colour c is black 'k' above, but you can change it with a colour spec like this.

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MATLAB: How can i plot multiple circles

figure
hold on
  for i=1:length(p)
        xunit=xp + p(i)
        yunit=yp + q(i)
      plot(xunit, yunit, 'Ob')
  end

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

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)

Best Answer

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MATLAB: How can i plot multiple circles

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

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