creata random plot

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Kugen Raj 2012-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/32722-creata-random-plot

i need to create a random plot inside a circle. i used the r = a + (b-a).*rand(100,1), but it is not working as i only get the positive values. i need to make random plot from a reference node of x,y(0,0) until 10 radius. how can i do this?

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回答（1 个）

Wayne King 2012-3-19

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Do you want the points to all have radius 10? or can they have random length up to 10?

If it's the former:

    phaseang = -pi+ 2*pi*rand(100,1);
    z = 10*exp(1j*phaseang);
    compass(real(z),imag(z));
    %or
    quiver(zeros(100,1),zeros(100,1),real(z),imag(z));

If the latter:

    magz = 1e-5+(10-1e-5)*rand(100,1);
    %or just magz = 10*rand(100,1);
    phaseang = -pi+ 2*pi*rand(100,1);
    z = magz.*exp(1j*phaseang);
    quiver(zeros(100,1),zeros(100,1),real(z),imag(z));