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Median frequency

`freq = medfreq(x)`

`freq = medfreq(x,fs)`

`freq = medfreq(pxx,f)`

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

`freq = medfreq(___,freqrange)`

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

`medfreq(___)`

`medfreq(___)`

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

`findpeaks`

| `meanfreq`

| `periodogram`

| `plomb`

| `pwelch`

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