PythonQ 240-8XX Manual do Utilizador descarregar pdf (Página 11)

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Array construction from a Python list

array(list, [datatype]) generates an array from a list:

>>> pl = [0, 1.2, 4, -9.1, 5, 8]

>>> a = array(pl)

The array elements are of the simplest possible type:

>>> z = array([1, 2, 3])

>>> print z # array of integers

[1 2 3]

>>> z = array([1, 2, 3], float)

>>> print z

[1. 2. 3.]

Atwo-dim.arrayfromtwoone-dim.lists:

>>> x = [0, 0.5, 1]; y = [-6.1, -2, 1.2] # Python lists

>>> a = array([x, y]) # form array with x and y as rows

From array to list: alist = a.tolist()

Numerical Python – p. 245/728

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PythonQ 240-8XX Manual do Utilizador Página 11