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python中np沒有定義_python中numpy.zeros(np.zeros)的使用方法

翻譯:

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

傳回:傳回來一個給定形狀和類型的用0填充的數組;

參數:shape:形狀

dtype:資料類型,可選參數,預設numpy.float64

dtype類型:

t ,位域,如t4代表4位

b,布爾值,true or false

i,整數,如i8(64位)

u,無符号整數,u8(64位)

f,浮點數,f8(64位)

c,浮點負數,

o,對象,

s,a,字元串,s24

u,unicode,u24

order:可選參數,c代表與c語言類似,行優先;F代表列優先

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', '

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

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', '

Type: builtin_function_or_method

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