plot.hierarchical_cluster: Plots a hierarchical_cluster Object
In trinker/clustext: Consistent Clustering for Text Data

Plots a hierarchical_cluster object

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## S3 method for class 'hierarchical_cluster'
plot(x, k = approx_k(get_dtm(x)), h = NULL,
  color = "red", digits = 3, ...)

`x`	A hierarchical_cluster object.
`k`	The number of clusters (can supply `h` instead). Defaults to use `approx_k` of the `DocumentTermMatrix` produced by `data_storage`. Boxes are drawn around the clusters.
`h`	The height at which to cut the dendrograms (determines number of clusters). If this argument is supplied `k` is ignored. A line is drawn showing the cut point on the dendrogram. If `h` is set to `TRUE` or `"locator"` then the cutting becomes interactive and the height is returned invisibly.
`color`	The color to make the cluster boxes (`k`) or line (`h`).
`digits`	The number o digits to display if h`h` is set to interactive.
`...`	Other arguments passed to `rect.hclust` or `abline`.