MATLAB画图圆圈

要在MATLAB中画一个圆圈，可以使用以下代码：

theta = linspace(0, 2*pi, 100); % 生成角度数组
r = 1; % 圆的半径
x = r * cos(theta); % 计算圆上点的x坐标
y = r * sin(theta); % 计算圆上点的y坐标

plot(x, y, 'k'); % 绘制圆圈
axis equal; % 设置坐标轴比例相等，使圆圈不会被拉伸

这段代码会生成一个半径为1的圆圈。你可以根据需要修改半径大小。
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