extracat (version 1.6-3)

dendro: Waterfall Dendrogram

Description

Draws an alternative to the dendrogram using cpcp coordinates. Colors according to a specific number of clusters make the interpretation easier. Also splits which follow each other within a margin of min.gap (proportion of maximum height) can be displayed by boxes.

Usage

dendro(x, k = 30, color.id = k - 2, label = FALSE, opts = list(),
 min.gap = 0.01, spline = FALSE, ...)

Arguments

x

A hierarchical clustering object.

k

The maximum number of clusters to plot. Possible are values up to N-1 but should usually be smaller.

color.id

The number of clusters for the coloring.

label

Whether or not to draw observation labels. Makes sense for small datasets.

opts

Graphics and colour parameters such as lwd, ps or alpha.

min.gap

Joins which are closer than min.gap from each other will be packed and displayed as a box.

spline

Whether or not to use spline curves instead of straight line connections between the points.

...

dots

Value

• TRUE

Examples

library(amap)
hc <- hcluster(USArrests)
# the full plot:
dendro(hc, k = 24, min.gap = 0.00)

# aggregation splits within 0.02 maximum height
dendro(hc, k = 24, min.gap = 0.02)

# the same graphic with spline curves instead of straight lines.
dendro(hc, k = 24, min.gap = 0.02, spline = TRUE)

# olive oil data
sx <- scale(olives[,-c(1,2,11)])
hc <- hcluster(sx)
plot(hc)
dendro(hc, 120, color.id = 6, min.gap=0.005)
dendro(hc, 120, color.id = 6, min.gap=0.1)

dendro(hc, 120, color.id = 6, min.gap=0.1, spline = TRUE)