Similar to, though simpler than, James's decimation problem: https://www.mathworks.com/matlabcentral/cody/problems/1092-decimation.
Most nonzero elements in row
Get the length of a given vector
Is this triangle right-angled?
length of a vector
Deleting an element in a matrix
How many rectangles in a grid ?
Speed of light:Experiment
rectangle in circle
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