MATLAB: How can I generate a random angle

random angle

I want to plot a random straight line with a fixed length based on the coordinates of a random point. Therefore I need to find a random angle. I figured everything out but the angle.

Best Answer

Try one of these:

rangrad = 2*pi*rand;                    % Radians
rangdeg = 360*rand;                     % Degrees

Experiment to get the result you want.

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MATLAB: How to generate n unique random numbers between 0 and 1? (No repeated values)

Unless I completely misunderstand something

rand(1, n)

is all you need. The probability of getting two exactly identical numbers is so small that you can pretty much assume it's never going to happen.

MATLAB: Generate random polar angles

The requested distribution of theta is generated below. Consequently the following code will places yellow dots on the unit sphere surface in a statistically uniform manner.

n = 8192;
theta = acos(1-2*rand(n,1)); % <-- The requested distribution
phi = 2*pi*rand(n,1);
x = sin(theta).*cos(phi);
y = sin(theta).*sin(phi);
z = cos(theta);
plot(x,y,z,'y.')

(Corrected)

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Related Solutions

MATLAB: How to generate n unique random numbers between 0 and 1? (No repeated values)

MATLAB: Generate random polar angles

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