To obtain the roots of characteristic equation for values of `K` specified by the user, the following commands can be used:

```
[r, K] = rlocus (n, d)
```

or

```
[r, K] = rlocus (n, d, K)
```

These commands will return matrix `r` containing the values of roots of the characteristic equation for the corresponding values of `K`.

The root locus plot can also be obtained by using `plot` command for matrix `r` obtained as outlined above and is as shown below:

r = rlocus (n, d); plot (r, ' ');

The `plot` command plots the root locus. Different line styles can be used in these plots. To plot the root loci with marks ‘o’ or ‘x’, the commands `plot (r, 'o')` or `plot (r, 'x'`) can be used.

Plot root locus and examine the stability ... |

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