you should ease up numerically on equality, so my solution works :)
The polar inertia is the sum of the squared distances of all points from the origin. https://en.wikipedia.org/wiki/Polar_moment_of_inertia
Remove any row in which a NaN appears
Find relatively common elements in matrix rows
Which doors are open?
Wind outward from the center ...
subtract central cross
Distance walked 2D
Check if sorted
Generate one sample of uniform random numbers between -pi and +pi
Distance walked 3D
A Simple Tide Gauge with MATLAB
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