R: Stripes Plot

stripes {flexclust} | R Documentation

## Stripes Plot

### Description

Plot distance of data points to cluster centroids using stripes.

### Usage

    stripes(object, groups=NULL, type=c("first", "second", "all"),
            beside=(type!="first"), col=NULL, gp.line=NULL, gp.bar=NULL,
            gp.bar2=NULL, number=TRUE, legend=!is.null(groups),
            ylim=NULL, ylab="distance from centroid",
            margins=c(2,5,3,2), ...)

### Arguments

`object` | An object of class `"kcca"`.
`groups` | Grouping variable to color-code the stripes. By default cluster membership is used as `groups`.
`type` | Plot distance to closest, closest and second-closest or to all centroids?
`beside` | Logical, make different stripes for different clusters?
`col` | Vector of colors for clusters or groups.
`gp.line, gp.bar, gp.bar2` | Graphical parameters for horizontal lines and background rectangular areas, see `gpar`.
`number` | Logical, write cluster numbers on x-axis?
`legend` | Logical, plot a legend for the groups?
`ylim, ylab` | Graphical parameters for y-axis.
`margins` | Margin of the plot.
`...` | Further graphical parameters.

### Details

A simple, yet very effective plot for visualizing the distance of each point from its closest and second-closest cluster centroids is a stripes plot. For each of the k clusters we have a rectangular area, which we optionally vertically divide into k smaller rectangles (`beside=TRUE`). Then we draw a horizontal line segment for each data point marking the distance of the data point from the corresponding centroid.

### Author(s)

Friedrich Leisch

### References

Friedrich Leisch. Neighborhood graphs, stripes and shadow plots for cluster visualization. Statistics and Computing, 20(4), 457–469, 2010.

### Examples

    bw05 <- bundestag(2005)
    bavaria <- bundestag(2005, state="Bayern")

    set.seed(1)
    c4 <- cclust(bw05, k=4, save.data=TRUE)
    plot(c4)

    stripes(c4)
    stripes(c4, beside=TRUE)

    stripes(c4, type="sec")
    stripes(c4, type="sec", beside=FALSE)
    stripes(c4, type="all")

    stripes(c4, groups=bavaria)

    ## ugly, but shows how colors of all parts can be changed
    library("grid")
    stripes(c4, type="all",
            gp.bar=gpar(col="red", lwd=3, fill="white"),
            gp.bar2=gpar(col="green", lwd=3, fill="black"))

[Package flexclust version 1.4-0 Index]