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

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Making ﬂoat, int, compl ex arrays

>>> a = zeros(3)

>>> print a.dtype # a’s data type

float64

>>> a = zeros(3, int)

>>> print a

[0 0 0]

>>> print a.dtype

int32

>>> a = zeros(3, float32) # single precision

>>> print a

[0. 0. 0.]

>>> print a.dtype

float32

>>> a = zeros(3, complex)

>>> a

array([ 0.+0.j, 0.+0.j, 0.+0.j])

>>> a.dtype

dtype(’complex128’)

>>> given an array a, make a new array of same dimension

>>> and data type:

>>> x = zeros(a.shape, a.dtype)

Numerical Python – p. 242/728

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PythonQ 240-8XX Manual do Utilizador Página 8