Covering some basic topics I haven't seen elsewhere on Cody.
Given an input matrix, generate an output matrix that consists of the input matrix replicated in a 2 by 2 pattern Examples:
[1] -> [1 1
1 1]
[1 2 -> [1 2 1 2
3 4] 3 4 3 4
1 2 1 2
3 4 3 4]
What is the distance from point P(x,y) to the line Ax + By + C = 0?
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Matlab Basics - Convert a row vector to a column vector
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