numpy.fromiter¶

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

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

Parameters

iteriterable object: An iterable object providing data for the array.
dtypedata-type: The data-type of the returned array.
countint, optional: The number of items to read from iterable. The default is -1, which means all data is read.
likearray_like: 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.

New in version 1.20.0.

Returns

Notes

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

Examples

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

numpy.fromfunction

numpy.fromstring