polar plots axis limits
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Richard Garner
am 7 Jun. 2011
Kommentiert: rhashaan omar
am 9 Sep. 2020
How does one set the axis limits in polar plots?
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Patrick Kalita
am 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 Kommentare
Jorge
am 18 Dez. 2015
Bearbeitet: Jorge
am 18 Dez. 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!
Weitere Antworten (2)
Steven Lord
am 29 Dez. 2016
With the introduction of the polaraxes function in release R2016a you now have access to properties like ThetaLim and RLim.
Mazin Mustafa
am 29 Dez. 2016
Bearbeitet: Mazin Mustafa
am 29 Dez. 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' );
1 Kommentar
rhashaan omar
am 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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