It looks like I forgot to put in size(x,2) instead of 4. Apparently the test suite didn't check that.
Remove any row in which a NaN appears
Create a cell array out of a struct
Return area of square
Length of the hypotenuse
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
A quadrant matrix
Duplicate each element of a vector.
Create a matrix X, where each column is a shifted copy of the vector v
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