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Mean frequency

`freq = meanfreq(x)`

`freq = meanfreq(x,fs)`

`freq = meanfreq(pxx,f)`

`freq = meanfreq(sxx,f,rbw)`

`freq = meanfreq(___,freqrange)`

```
[freq,power]
= meanfreq(___)
```

`meanfreq(___)`

`meanfreq(___)`

with no output
arguments plots the PSD or power spectrum and annotates the mean frequency.

`findpeaks`

| `medfreq`

| `periodogram`

| `plomb`

| `pwelch`

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