Silhouette plot

`silhouette(`

accepts one or more additional distance metric parameter values when you specify
`X`

,`clust`

,`Distance`

,`DistParameter`

)`Distance`

as a custom distance function handle
`@`

that accepts the additional
parameter values.`distfun`

[1] Kaufman L., and P. J. Rousseeuw.
*Finding Groups in Data: An Introduction to Cluster Analysis*. Hoboken,
NJ: John Wiley & Sons, Inc., 1990.