How to do polar plot correctly?

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.

Answer 1

[Dishant Arora]

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']

[John]

Hi, Dishant:

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

[John]

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')