It looks like I forgot to put in size(x,2) instead of 4. Apparently the test suite didn't check that.
Find common elements in matrix rows
Reverse the elements of an array
matrix of natural number
Find nth maximum
vectorization in N
Find the elements of a matrix according to a defined property.
Remove NaN ?
Create a matrix X, where each column is a shifted copy of the vector v
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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