Connect Four Win Checker
Change the sign of even index entries of the reversed vector
Add a row of zeros on top of a matrix
Create a matrix X, where each column is a shifted copy of the vector v
First non-zero element in each column
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Remove NaN ?
Find the elements of a matrix according to a defined property.
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