f=@(A)det(A*A')>.5
 
f([[0,1];[2,3]])
f([[1,2];[2,4]])
f([[2,6,8];[3,9,12]])
f([[1,2];[2,3];[3,4]])
f([[1,0,0];[0,1,0];[0,0,1]])
f([[0]])
f([])
f([[1,1];[0,1];[1,0]])
f([[1,2,3];[1,3,5];[0,0,0]])