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polar plots axis limits

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How does one set the axis limits in polar plots?

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Accepted Answer

Patrick Kalita
Patrick Kalita on 7 Jun 2011
Well, unfortunately there's no direct way to do it. But you can cheat (yay! cheating!). Let's say you know you want to have the radial dimension go out to 2. You can add a line of constant radius and then make it invisible:
t = 0 : .01 : 2 * pi;
P = polar(t, 2 * ones(size(t)));
set(P, 'Visible', 'off')
Now you can add the data you actually want to plot:
hold on
polar(t, sin(2 * t) .* cos(2 * t), '--r')

  3 Comments

Eric T
Eric T on 25 Oct 2015
Cool trick. It is the multiple-year, uncorrected, lack of obvious basic functionality like this in many Matlab functions that pushes people toward Python.
Jorge
Jorge on 18 Dec 2015
@Eric Agreed. The lack of coherence between MATLAB function is a shame. In this case, we have a plotting function where not only xlim or ylim just don't work, you can't also for instance use 'LineWidth' as argument as you do with plot(). But if you do p = polar(), p.LineWidth property does in fact exists! It is just that someone could't be bothered to add property pairs to polar() itself in more than a decade!
Richard Garner
Richard Garner on 1 Jan 2017
Thanks for your responses. But I have to take a little exception to your criticism of Matlab. I don't know of any software that is perfect, including Python. I used Python as well as Matlab and find a lot of "issues" with it. My feeling is that alot of people migrate to Python because it's free. Of course, it obviously has ALOT of nice functionality that rivals or even supercedes Matlab. But also that doesn't match up to Matlab. Anyway, just my "2 cents" worth.

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More Answers (2)

Steven Lord
Steven Lord on 29 Dec 2016
With the introduction of the polaraxes function in release R2016a you now have access to properties like ThetaLim and RLim.

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Richard Garner
Richard Garner on 1 Jan 2017
Thanks for that. I did not notice. Guess I hadn't made polar axis plots in awhile.

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Mazin Mustafa
Mazin Mustafa on 29 Dec 2016
Edited: Mazin Mustafa on 29 Dec 2016
If you want to plot something such as antenna pattern for e.g. -40 dB to 0dB you may use the following code:
data = 10*log10(abs(data)./max(abs(data))); % Normalize your data
range = -40; % Choose the minimum value in dB
data(isnan(data)) = range;
data = data - range;
data = data./max(data);
data(data < 0) = 0;
polar(theta,data,'k')
view([90 270])
set(findall(gcf, 'String', '0' ),'String', ' ');
set(findall(gcf, 'String', ' 0.2' ),'String', num2str(range-(range*0.2)) );
set(findall(gcf, 'String', ' 0.4' ),'String', num2str(range-(range*0.4)) );
set(findall(gcf, 'String', ' 0.6' ),'String', num2str(range-(range*0.6)) );
set(findall(gcf, 'String', ' 0.8' ),'String', num2str(range-(range*0.8)) );
set(findall(gcf, 'String', ' 1' ),'String', '0 dB' );

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rhashaan omar
rhashaan omar on 9 Sep 2020
could you explain? I'm trying to plot a graph of antenna radiation from -30 to 10 dB. I have a table of the values I digitized using an onlne website, but I can't scale my graph to match the original graph.

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