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python中numpy.zeros(np.zeros)的使用方法

作者:jingxian  发布时间:2023-10-08 17:40:07 

标签:python,numpy.zeros,np.zeros

翻译:

用法:zeros(shape, dtype=float, order='C')

返回:返回来一个给定形状和类型的用0填充的数组;

参数:shape:形状

dtype:数据类型,可选参数,默认numpy.float64

dtype类型:

t ,位域,如t4代表4位

b,布尔值,true or false

i,整数,如i8(64位)

u,无符号整数,u8(64位)

f,浮点数,f8(64位)

c,浮点负数,

o,对象,

s,a,字符串,s24

u,unicode,u24

order:可选参数,c代表与c语言类似,行优先;F代表列优先

例子:


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')])

########################################################

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

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_like : Return an array of zeros with shape and type of input.
ones_like : Return an array of ones with shape and type of input.
empty_like : Return an empty array with shape and type of input.
ones : Return a new array setting values to one.
empty : Return 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')])
Type:   builtin_function_or_method

来源:http://blog.csdn.net/qq_26948675/article/details/54318917

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