# tensorplay.functional.signbit

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

```python
tensorplay.functional.signbit(input, *, out=None) → Tensor
```

Tests if each element of input has its sign bit set or not.

Parameters:

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

Keyword Arguments:

out ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor), optional) – the output tensor.

Example:

```
>>> a = tensorplay.tensor([0.7, -1.2, 0., 2.3])
>>> tensorplay.signbit(a)
tensor([ False, True,  False,  False])
>>> a = tensorplay.tensor([-0.0, 0.0])
>>> tensorplay.signbit(a)
tensor([ True,  False])
```

> **Note**
>
> signbit handles signed zeros, so negative zero (-0) returns True.