One small point - indexing between the two is different. If you just copy everything from MATLAB to Python, as you seem to have done, you'll be very very confused. MATLAB x(1:5:end) translates to Python x0::5.
Go back to NumPy for MATLAB Users and scan down to the section called "Linear Algebra Equivalents" (about halfway down the page). It gives a dictionary of how to go back and forth.
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