How to do polar plot correctly?

Question

John 2014-6-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137374-how-to-do-polar-plot-correctly

评论： John 2014-6-25

The task is to plot each group in different symbol and color and show them at their "angle" location in polar plot. This script was used:

    factor = 1.2 * 1e-3;
    n = 7;
    f = [400  200  -10  -200  -300];
    symb = ['ro' 'bd' 'gs' 'm^' 'cv' 'r+' 'bx'];
    figure('color','white')
    hold on
    for nn=1:n
        t =  (nn-1)*factor;
        A = exp(-1i*2*pi*t*f);
        [THETA,RHO] = cart2pol(real(A), imag(A));
        polar(THETA,RHO,symb(nn))
    end
    hold off

However this was what it output. Obviously this is not correct, no polar graph and no color symbol. Something must be wrong.

Above, if no color used by using the script below, it plot as the second graph below:

symb = ['o' 'd' 's' '^' 'v' '+' 'x'];

Thank you for pointing out the mistake.

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Answer 1

Dishant Arora 2014-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/137374-how-to-do-polar-plot-correctly#answer_142256

编辑：Dishant Arora 2014-6-24

在 MATLAB Online 中打开

Define your symb a cell array that is

symb = {'ro' 'bd' 'gs' 'm^' 'cv' 'r+' 'bx'}

To know where you went wrong, check out the echo of following command at command window:

symb = ['ro' 'bd' 'gs' 'm^' 'cv' 'r+' 'bx']

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John 2014-6-24

编辑：John 2014-6-24

Hi, Dishant:

Thanks! How to plot it as desired "POLAR" plot like Matlat doc example?

John 2014-6-25

在 MATLAB Online 中打开

I found out that the polar plot doesn't accept 'hold on' command. The script below plots perfect polar chart. But as soon as a 'hold on' is added, it became a non-polar plot.

Hope Mathworks can fix this and make it a real polar plot.

    factor = 1.2 * 1e-3;
    f = [400  200  -10  -200  -300];
    figure('color','white')
    t =  2*factor;
    A = exp(-1i*2*pi*t*f);
    [THETA,RHO] = cart2pol(real(A), imag(A));
    polar(THETA,RHO,'ro')