image - Matlab - 圆边上的点矩阵

Question

如何在 Matlab 中找到构成任意半径圆的边缘的点矩阵？如果我绘制这些点，我应该得到一个接近圆的东西（尽管一个光滑的圆是由无限数量的点组成的）。

Answer 1

radius = 5;                                    %desired radius
numPoints = 1000;                              %Number of points in your circle
angles = linspace(0,2*pi,numPoints)';          %Angles evenly spread around the circle, from 0 to 2*pi radians
xyCircle = radius*[cos(angles) sin(angles)];   %This is the matrix you probably want

plot(xyCircle(:,1), xyCircle(:,2),'.'); %Quick plot to check the result
axis equal;