xorbits.numpy.expand_dims

xorbits.numpy.expand_dims(a, axis)

Expand the shape of an array.

Insert a new axis that will appear at the axis position in the expanded array shape.

参数

• a (array_like) – Input array.

• axis (int or tuple of ints) –

  Position in the expanded axes where the new axis (or axes) is placed.

  1.13.0(numpy) 版后已移除: Passing an axis where axis > a.ndim will be treated as axis == a.ndim, and passing axis < -a.ndim - 1 will be treated as axis == 0. This behavior is deprecated.

  在 1.18.0(numpy) 版更改: A tuple of axes is now supported. Out of range axes as described above are now forbidden and raise an AxisError.

返回

result – View of a with the number of dimensions increased.

返回类型

ndarray

参见

squeeze

The inverse operation, removing singleton dimensions

reshape

Insert, remove, and combine dimensions, and resize existing ones

doc.indexing, atleast_1d, atleast_2d, atleast_3d

实际案例

>>> x = np.array([1, 2])  
>>> x.shape  
(2,)

The following is equivalent to x[np.newaxis, :] or x[np.newaxis]:

>>> y = np.expand_dims(x, axis=0)  
>>> y  
array([[1, 2]])
>>> y.shape  
(1, 2)

The following is equivalent to x[:, np.newaxis]:

>>> y = np.expand_dims(x, axis=1)  
>>> y  
array([[1],
       [2]])
>>> y.shape  
(2, 1)

axis may also be a tuple:

>>> y = np.expand_dims(x, axis=(0, 1))  
>>> y  
array([[[1, 2]]])

>>> y = np.expand_dims(x, axis=(2, 0))  
>>> y  
array([[[1],
        [2]]])

Note that some examples may use None instead of np.newaxis. These are the same objects:

>>> np.newaxis is None  
True

This docstring was copied from numpy.