# 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, *, dtype=<DType.float32: 8>, device=None, out=None)
```

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

Parameters:

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

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

- device (dtype /) – forwarded to the factory ops. Default: float32/CPU