polar plot to create circular shape with varying radius

Question

William Gray 2019-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/472508-polar-plot-to-create-circular-shape-with-varying-radius

评论： Star Strider 2019-7-19

采纳的回答： Star Strider

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Hi Everyone,

I'm new to polar plotting and I'm struggling to sucesfully plot what I'm after.

I want to polar plot a random variable around an origin of my choice. I have tried to do this through the following code:

k = round(rand(1,50)*10)+10;
Th = linspace(0,2*pi,50);
Rho = k.*sin(Th);
figure
polar(Th,Rho)

However, this isn't quite working. As all the values are positive it's cramping the plot in the top 2 quadrants. Please see attached plot for what I mean. I have sketched the kind of plot I am after (apologies for how rough this sketch is) but any ideas would be realy appreciated.

Thanks everyone!

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Answer 1

Star Strider 2019-7-19

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Plotting the sine function in a polar plot will produce one circle in the upper half of the polar axes.

To get the sort of plot you want, do this:

figure
polar(Th,k)

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William Gray 2019-7-19

Hi,

Thank you for this, a simple change but it gives me exactly what I was after!

Star Strider 2019-7-19

As always, my pleasure!

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Answer 2

infinity 2019-7-19

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Hello,

How about if you change a bit like this

clear
close all
% k = round(rand(1,50)*10)+10;
k = round(rand(1,50));
Th = linspace(0,2*pi,50);
% Rho = k.*sin(Th);
Rho = k.*sin(Th)-10;
figure
polar(Th,Rho)

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William Gray 2019-7-19

Hi,

Thanks for the answer this helps! Ive found from the script however that the 'randomness' of the values appear slightly stunted, I think because the rounding of k just gives zero's and ones. I've managed to plot what I was after below with Star Strider's answer but again, thank you for the help.

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