It looks like I forgot to put in size(x,2) instead of 4. Apparently the test suite didn't check that.
Test if two numbers have the same digits
03 - Matrix Variables 5
Find nth maximum
Remove NaN ?
Find the elements of a matrix according to a defined property.
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Matrix which contains the values of an other matrix A at the given locations.
Matrix with different incremental runs
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