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Third-order intercept point

`oip3 = toi(x)`

`oip3 = toi(x,fs)`

`oip3 = toi(pxx,f,'psd')`

`oip3 = toi(sxx,f,rbw,'power')`

```
[oip3,fundpow,fundfreq,imodpow,imodfreq]
= toi(___)
```

`toi(___)`

`[`

also returns the power, `oip3`

,`fundpow`

,`fundfreq`

,`imodpow`

,`imodfreq`

]
= toi(___)`fundpow`

,
and frequencies, `fundfreq`

, of the two fundamental
sinusoids. It also returns the power, `imodpow`

,
and frequencies, `imodfreq`

, of the lower and upper
intermodulation products. This syntax can use any of the input arguments
in the preceding syntaxes.

`toi(___)`

with no output arguments
plots the spectrum of the signal and annotates the lower and upper
fundamentals *( f_{1}, f_{2})* and
intermodulation products

[1] Kundert, Kenneth S. "Accurate and Rapid Measurement
of *IP*_{2} and *IP*_{3}."
May, 2002. http://www.designers-guide.org/Analysis/intercept-point.pdf.

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