Polar Plot RLim Not Working

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Jon Ho
Jon Ho 2022-2-1
评论： Simon Chan 2022-2-1
I am currently plotting a graph of a certain radiation pattern. I do not want any negative radius values to be plotted. To "recitfy" this situationl, I utilized rlim. However, Negative values are still appearing. Thanks in advance.
This is my code:
theta = linspace(-10*pi,10*pi,10000);
rho = 10.*log10((cos(theta)).^9) + 30;
polarplot(theta, rho);
rlim([0 30]);
This is the graph: I do not wish to see the top and bottom lobes.

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Simon Chan
Simon Chan 2022-2-1
Determine the index for non-negative number of rho only.
Beware your data are complex number.
theta = linspace(-10*pi,10*pi,10000);
rho = 10.*log10((cos(theta)).^9) + 30;
idx.pos = rho>=0; % Determine non-negative rho
polarplot(theta(idx.pos), rho(idx.pos));
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Jon Ho
Jon Ho 2022-2-1
I see, this is the same shape as the polar plot that is not db scale and is not corrected to remove the negative values.
Simon Chan
Simon Chan 2022-2-1
Yes, the shape is the same.
Function polarpattern provides interactive data visualization and measurement.

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