# tensorplay.fft._frequency.fftfreq

Source: https://www.tensorplay.cn/docs/generated/tensorplay.fft._frequency.fftfreq.html

```python
tensorplay.fft._frequency.fftfreq(n, d=1.0, *, out=None, dtype=None, layout=None, device=None, requires_grad=False)
```

DFT sample frequencies (cycles/unit): [0, 1, ..., (n-1)//2, -(n//2), ..., -1] / (n*d).

Parameters:

- n ([int](https://docs.python.org/3/builtins/functions.html#int)) – window length

- d ([float](https://docs.python.org/3/builtins/functions.html#float), optional) – sample spacing. Default: 1.0

- device (dtype / layout /) – of the result. Default: the default floating dtype, on the CPU