PythonQ 240-8XX Uživatelský manuál stáhnout pdf (Strana 13)

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Changing array dimensions

>>> a = array([0, 1.2, 4, -9.1, 5, 8])

>>> a.shape = (2,3) # turn a into a 2x3 matrix

>>> print a

[[ 0. 1.2 4. ]

[-9.1 5. 8. ]]

>>> a.size

>>> a.shape = (a.size,) # turn a into a vector of length 6 again

>>> a.shape

(6,)

>>> print a

[0. 1.2 4. -9.1 5. 8.]

>>> a = a.reshape(2,3) # same effect as setting a.shape

>>> a.shape

(2, 3)

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PythonQ 240-8XX Uživatelský manuál Strana 13