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How to use the data, but no polar function, to make polar plot?

Date: 2023-08-08 11:35:57

Hi,
 
I am wondering how to use the data, but not polar function, to make polar plot in MATLAB.
 
My data is like between 0to 1/2pi, the value equal to 1;
 
between 1/2pi to pi, the value equal to 2;
 
between pi to 3/2pi, the value equal to 3;
 
between 3/2pi to 2pi, the value equal to 1.5.
 
I noticed that it is very easy to make polar plot when there is a polar function between theta and r,
however, I only have the data but no function....
 
I wonder is it possible to make polar plot just using my data? Or...how to make a polar function using my data?
 
 

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Expert Answer:

:
I would use polar to plot the data; however it looks like R2016a has a preferred option -- polarplot ( doc ).
 
With polar, you could try
 
 theta = linspace(0,2*pi,1e3); % more values yeilds a smoother plot
 r = nan(size(theta)); % pre-allocate r
 r(theta<pi/2) = 1;
 r(theta>=pi/2&theta<pi) = 2;
 r(theta>=pi&theta<3*pi/2) = 3;
 r(theta>=3*pi/2) = 1.5;
 r(end) = 1; % makes it a closed loop

 polar(theta,r)

 

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