It looks like I forgot to put in size(x,2) instead of 4. Apparently the test suite didn't check that.
Back to basics 6 - Column Vector
Change the sign of even index entries of the reversed vector
frame of the matrix
03 - Matrix Variables 2
Remove NaN ?
A quadrant matrix
Matrix which contains the values of an other matrix A at the given locations.
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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