Tips for golfing in MATL
Know the predefined literals
Although some of them keep information when copied to the clipboard, they all have a predefined value.

F, pushes 0 (actually False)
T, pushes 1 (actually True)
H, pushes 2 (predefined clipboard value)
I, pushes 3 (predefined clipboard value)
K, pushes 4 (predefined clipboard value)
J, pushes 0 + 1j (predefined clipboard value)

Not sure if I have covered all predefined values though.