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# evans

Evans root locus

### Syntax

evans(H [,kmax])

### Arguments

- H
SISO linear system given by a transfer or a state space representation (see:syslin).

- kmax
real (maximum gain desired for the plot )

### Description

Gives the Evans root locus for a SISO linear system in state-space or
transfer form H(s) (syslin). This is
the locus of the roots of
`1+k*H(s)=1+k*N(s)/D(s)`

, in the complex
plane. For a selected sample of gains ```
k <=
kmax
```

,the imaginary part of the roots of
`D(s)+k*N(s)`

is plotted vs the real part.

To obtain the gain at a given point of the locus you can activate the datatips manager and click the desired point on the root locus.

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