dask.array.array
dask.array.array¶
- dask.array.array(object, dtype=None, *, copy=True, order='K', subok=False, ndmin=0, like=None)[source]¶
This docstring was copied from numpy.array.
Some inconsistencies with the Dask version may exist.
Create an array.
- Parameters
- objectarray_like
An array, any object exposing the array interface, an object whose
__array__
method returns an array, or any (nested) sequence. If object is a scalar, a 0-dimensional array containing object is returned.- dtypedata-type, optional
The desired data-type for the array. If not given, NumPy will try to use a default
dtype
that can represent the values (by applying promotion rules when necessary.)- copybool, optional
If true (default), then the object is copied. Otherwise, a copy will only be made if
__array__
returns a copy, if obj is a nested sequence, or if a copy is needed to satisfy any of the other requirements (dtype
,order
, etc.).- order{‘K’, ‘A’, ‘C’, ‘F’}, optional
Specify the memory layout of the array. If object is not an array, the newly created array will be in C order (row major) unless ‘F’ is specified, in which case it will be in Fortran order (column major). If object is an array the following holds.
order
no copy
copy=True
‘K’
unchanged
F & C order preserved, otherwise most similar order
‘A’
unchanged
F order if input is F and not C, otherwise C order
‘C’
C order
C order
‘F’
F order
F order
When
copy=False
and a copy is made for other reasons, the result is the same as ifcopy=True
, with some exceptions for ‘A’, see the Notes section. The default order is ‘K’.- subokbool, optional
If True, then sub-classes will be passed-through, otherwise the returned array will be forced to be a base-class array (default).
- ndminint, optional
Specifies the minimum number of dimensions that the resulting array should have. Ones will be prepended to the shape as needed to meet this requirement.
- likearray_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.New in version 1.20.0.
- Returns
- outndarray
An array object satisfying the specified requirements.
See also
empty_like
Return an empty array with shape and type of input.
ones_like
Return an array of ones with shape and type of input.
zeros_like
Return an array of zeros with shape and type of input.
full_like
Return a new array with shape of input filled with value.
empty
Return a new uninitialized array.
ones
Return a new array setting values to one.
zeros
Return a new array setting values to zero.
full
Return a new array of given shape filled with value.
Notes
When order is ‘A’ and
object
is an array in neither ‘C’ nor ‘F’ order, and a copy is forced by a change in dtype, then the order of the result is not necessarily ‘C’ as expected. This is likely a bug.Examples
>>> np.array([1, 2, 3]) array([1, 2, 3])
Upcasting:
>>> np.array([1, 2, 3.0]) array([ 1., 2., 3.])
More than one dimension:
>>> np.array([[1, 2], [3, 4]]) array([[1, 2], [3, 4]])
Minimum dimensions 2:
>>> np.array([1, 2, 3], ndmin=2) array([[1, 2, 3]])
Type provided:
>>> np.array([1, 2, 3], dtype=complex) array([ 1.+0.j, 2.+0.j, 3.+0.j])
Data-type consisting of more than one element:
>>> x = np.array([(1,2),(3,4)],dtype=[('a','<i4'),('b','<i4')]) >>> x['a'] array([1, 3])
Creating an array from sub-classes:
>>> np.array(np.mat('1 2; 3 4')) array([[1, 2], [3, 4]])
>>> np.array(np.mat('1 2; 3 4'), subok=True) matrix([[1, 2], [3, 4]])