xorbits.numpy.fromiter#

xorbits.numpy.fromiter(iter, dtype, count=- 1, *, like=None)#

Create a new 1-dimensional array from an iterable object.

参数

  • iter (iterable object) – An iterable object providing data for the array.

  • dtype (data-type) –

    The data-type of the returned array.

    在 1.23(numpy) 版更改: Object and subarray dtypes are now supported (note that the final result is not 1-D for a subarray dtype).

  • count (int, optional) – The number of items to read from iterable. The default is -1, which means all data is read.

  • like (array_like, optional) –

    Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as like supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

    1.20.0(numpy) 新版功能.

返回

out – The output array.

返回类型

ndarray

提示

Specify count to improve performance. It allows fromiter to pre-allocate the output array, instead of resizing it on demand.

实际案例

>>> iterable = (x*x for x in range(5))  
>>> np.fromiter(iterable, float)  
array([  0.,   1.,   4.,   9.,  16.])

A carefully constructed subarray dtype will lead to higher dimensional results:

>>> iterable = ((x+1, x+2) for x in range(5))  
>>> np.fromiter(iterable, dtype=np.dtype((int, 2)))  
array([[1, 2],
       [2, 3],
       [3, 4],
       [4, 5],
       [5, 6]])

警告

This method has not been implemented yet. Xorbits will try to execute it with numpy.

This docstring was copied from numpy.