Obtaining vertical and horizontal values from polarplot

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matlabkid602 2021-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/1596564-obtaining-vertical-and-horizontal-values-from-polarplot

编辑： Les Beckham 2022-1-4

I have data theta and rho data which produces a polar plot via the polarplot function.

I want to obtain the values for every angle of the y value divided by the x value, I am struggling on how to obtain this from the polarplot. Any help much appreciated.

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Answer 1

Les Beckham 2021-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/1596564-obtaining-vertical-and-horizontal-values-from-polarplot#answer_841079

编辑：Les Beckham 2022-1-4

在 MATLAB Online 中打开

The polarplot function won't give you the x and y data. So, you need to calculate it yourself.

I've made up r and theta values since you didn't provide yours.

theta = linspace(0, 2*pi, 100);

r = 1 + (1 + cos(theta))/2;

polarplot(theta, r)

% calculate x and y from r and theta

x = r.*sin(theta);

y = r.*cos(theta);

% plot x divided by y against theta

plot(theta, x./y) % note the ./ to get element-by-element divide

grid on

xlabel 'theta'

ylabel 'x/y'

Note that x divided by y actually goes to infinity when y = 0. Fortunately, the linearly spaced theta vector that I used didn't result in any y values that were exactly zero or we would have gotten an error. due to dividing by zero.