MATLAB: How to set an axis outside the polar figure like this photo

polarplotscalebar

Hello friends,

I want to add a scalebar of my r-axis and label it like the figure I show (with red ring), but it seem not easy to move the exsisting axis, what should I do?

Can anyone help me? I really appreciate it.

Best Answer

You could create Cartesian axes which overlie the polar axes and are invisible except for the y axis, whose ticks are set to match the r axis ticks:

pa = polaraxes('Position', [0.25 0.25 0.6 0.6]);
polarplot(pa, randi(10,10,1),'o');
pa.RTickLabel = [];
a = axes('Color', 'none',...
    'XColor', 'none',...
    'Position', pa.Position,...
    'YLim', [-pa.RLim(2) pa.RLim(2)],...
    'YTick', unique([-flip(pa.RTick) pa.RTick]));
ylabel(a, 'r axis label')

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MATLAB: How to set an axis outside the polar figure

I've modified your code. Not sure how robust this solution is, but you can try this:

figure(2)
set(gcf,'color','w');
ax = polaraxes('Position', [0.25 0.25 0.6 0.6])
ax.ThetaDir = 'counterclockwise';
ax.ThetaZeroLocation = 'left';
rlim([70,120])
ax.RTickLabel = [];
ticks = [-flip(ax.RTick(2:end)) ax.RTick];
a = axes('Color', 'none',...
    'XColor', 'none',...
    'Position', [ax.Position(1),ax.Position(2)+ax.Position(4)/2,...
    ax.Position(3),ax.Position(4)/2],...
    'YLim', [ax.RLim(1) ax.RLim(2)],...
    'YTick', ticks,...
    'YTickLabel', abs(ticks));
a_m = copyobj(a,gcf)
a_m.Position = a.Position - [0 a.Position(4),0,0];
a_m.YAxis.Direction = 'reverse';
ylabel(a, 'r axis label')
a.YAxis.Label.Position = [a.YAxis.Label.Position(1),70,0];

Best Answer

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MATLAB: Deletting X and Y axes ticks

MATLAB: How to set an axis outside the polar figure

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