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numpy.zeros(shape, dtype=float, order='C')

2016-03-25 11:58 711 查看

numpy.zeros

Return a new array of given shape and type, filled with zeros.

Parameters:shape : int or sequence of ints


Shape of the new array, e.g., (2, 3) or 2.


dtype : data-type, optional


The desired data-type for the array, e.g., numpy.int8. Default is numpy.float64.


order : {‘C’, ‘F’}, optional


Whether to store multidimensional data in C- or Fortran-contiguous (row- or column-wise) order in memory.


Returns:out : ndarray


Array of zeros with the given shape, dtype, and order.


See also

zeros_likeReturn an array of zeros with shape and type of input.ones_likeReturn an array of ones with shape and type of input.empty_likeReturn an empty array with shape and type of input.onesReturn a new array setting values to one.emptyReturn a new uninitialized array.
Examples

>>>
>>> np.zeros(5)
array([ 0.,  0.,  0.,  0.,  0.])


>>>
>>> np.zeros((5,), dtype=np.int)
array([0, 0, 0, 0, 0])


>>>
>>> np.zeros((2, 1))
array([[ 0.],
[ 0.]])


>>>
>>> s = (2,2)
>>> np.zeros(s)
array([[ 0.,  0.],
[ 0.,  0.]])


>>>
>>> np.zeros((2,), dtype=[('x', 'i4'), ('y', 'i4')]) # custom dtype
array([(0, 0), (0, 0)],
dtype=[('x', '<i4'), ('y', '<i4')])
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