# tensorplay.functional.rot90

Source: https://www.tensorplay.cn/docs/generated/tensorplay.functional.rot90.html

```python
tensorplay.functional.rot90(input, k=1, dims=(0, 1)) → Tensor
```

Rotate an n-D tensor by 90 degrees in the plane specified by dims axis.
Rotation direction is from the first towards the second axis if k > 0, and from the second towards the first for k < 0.

Parameters:

- input ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – the input tensor.

- k ([int](https://docs.python.org/3/builtins/functions.html#int)) – number of times to rotate. Default value is 1

- dims (a list or [tuple](https://docs.python.org/3/builtins/stdtypes.html#tuple)) – axis to rotate. Default value is [0, 1]

Example:

```
>>> x = tensorplay.arange(4).view(2, 2)
>>> x
tensor([[0, 1],
        [2, 3]])
>>> tensorplay.rot90(x, 1, [0, 1])
tensor([[1, 3],
        [0, 2]])

>>> x = tensorplay.arange(8).view(2, 2, 2)
>>> x
tensor([[[0, 1],
         [2, 3]],

        [[4, 5],
         [6, 7]]])
>>> tensorplay.rot90(x, 1, [1, 2])
tensor([[[1, 3],
         [0, 2]],

        [[5, 7],
         [4, 6]]])
```