MATLAB: Polarplot with negative theta display

polarplot

Hi everyone, I have used the polarplot function in Matlab. The theta axis by default will be from 0 to 360 degree. But I would like to display theta from -150 to 180, similar to the attached figure. Could you please help? Thanks

Best Answer

You can plot it by tuning axes properties, like:

% Sample data
theta = deg2rad(-150:30:180);
rho = 10*rand(size(theta));
% Polar plot with [-180 180] degree
polarplot(theta,rho)
ax = gca;
ax.ThetaLim = [-180 180];
ax.ThetaZeroLocation = 'top';
ax.ThetaDir = 'clockwise';

Related Solutions

MATLAB: How to rotate the axis for a polar plot

See the answer at http://www.mathworks.com/matlabcentral/answers/93690-how-do-i-rotate-or-flip-a-polar-plot which changes the viewpoint specification using view. For your case, you would want to call (after the polar plot has been created)

 view([90 -90])

MATLAB: Two curves on different r axis in polarplot

One option —

Add these assignments:

rlbl = sprintfc('%.0f',(0:2:6));                                % Radius Labels

text(ones(1,4)*1.8*pi, (0:2:6)*0.1, rlbl, 'Color','r')          % Label Radii

so your example code becomes:

t = 0 : 2*pi/177 : 2*pi;
a=linspace(0.3,0.5,178);
m=linspace(0.4,0.6,178);
figure(3)
ax = polaraxes;
hold on
polarplot(ax,t,a,'-b')
polarplot(ax,t,m,'-r')
ax.RColor ='blue';
ax.ThetaDir = 'counterclockwise';
ax.ThetaZeroLocation = 'bottom';
thetaticks([0:30:360])
thetaticklabels({'180','150','120','90','60','30','0','330','300','270','240','210'})
rlbl = sprintfc('%.0f',(0:2:6));                                % Radius Labels
text(ones(1,4)*1.8*pi, (0:2:6)*0.1, rlbl, 'Color','r')          % Label Radii

Experiment to get the result you want.

Best Answer

Related Solutions

MATLAB: How to rotate the axis for a polar plot

MATLAB: Two curves on different r axis in polarplot

Related Question