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Compute or plot passivity index as function of frequency

`passiveplot(G)`

`passiveplot(G,type)`

`passiveplot(___,w)`

`passiveplot(G1,G2,...,GN,___)`

`passiveplot(G1,LineSpec1,...,GN,LineSpecN,___)`

```
[index,wout]
= passiveplot(G)
```

```
[index,wout]
= passiveplot(G,type)
```

`index = passiveplot(G,w)`

```
index =
passiveplot(G,type,w)
```

`passiveplot(`

plots
the relative passivity indices of the dynamic system `G`

)`G`

as
a function of frequency. When `I + G`

is minimum
phase, the relative passivity indices are the singular values of ```
(I
- G)(I + G)^-1
```

. The largest singular value measures the
relative excess `(R < 1)`

or shortage ```
(R
> 1)
```

at each frequency. See `getPassiveIndex`

for
more information about the meaning of the passivity index.

`passiveplot`

automatically chooses the frequency
range and number of points for the plot based on the dynamics of `G`

.

`passiveplot(___,`

plots
the passivity index for frequencies specified by `w`

)`w`

.

If

`w`

is a cell array of the form`{wmin,wmax}`

, then`passiveplot`

plots the passivity index at frequencies ranging between`wmin`

and`wmax`

.If

`w`

is a vector of frequencies, then`passiveplot`

plots the passivity index at each specified frequency.

You can use this syntax with any of the previous input-argument combinations.