barplot-methods {flexclust}R Documentation

Barplot/chart Methods in Package ‘flexclust’

Description

Barplot of cluster centers or other cluster statistics.

Usage

## S4 method for signature 'kcca':
barplot(height, bycluster = TRUE, oneplot = TRUE,
    data = NULL, FUN=colMeans, main = deparse(substitute(height)), 
    which = 1:height@k, names.arg = NULL,
    oma=par("oma"), col=NULL, mcol="darkred", srt=45, ...)

## S4 method for signature 'kcca':
barchart(x, data, xlab="",
    strip.labels=NULL, strip.prefix="Cluster ",
    col=NULL, mcol="darkred", which=NULL, legend=FALSE, ...)

Arguments

height, x An object of class "kcca".
bycluster If TRUE, then each barplot shows one cluster. If FALSE, then each barplot compares all cluster for one input variable.
oneplot If TRUE, all barplots are plotted together on one page, else each plot is on a separate page.
data If not NULL, cluster membership is predicted for the new data and used for the plots. By default the values from the training data are used. Ignored by the barchart method.
FUN The function to be applied to each cluster for calculating the bar heights. Only used, if data is not NULL.
which For barplot index number of clusters for the plot, for barchart index numbers or names of variables to plot.
names.arg A vector of names to be plotted below each bar.
main, oma, xlab, ... Graphical parameters.
col Vector of colors for the clusters.
mcol If not NULL, the value of FUN for the complete data set is plotted over each bar as a line segment with color mcol.
srt Number between 0 and 90, rotation of the x-axis labels.
strip.labels Vector of strings for the strips of the Trellis display.
strip.prefix Prefix string for the strips of the Trellis display.
legend If TRUE, the barchart is always plotted on the current graphics device and a legend is added to the bottom of the plot.

Note

The flexclust barchart method uses a horizontal arrangements of the bars, and sorts them from top to bottom. Default barcharts in lattice are the other way round (bottom to top). See the examples below how this affects, e.g., manual labels for the y axis.

Author(s)

Friedrich Leisch

Examples

  cl <- cclust(iris[,-5], k=3)
  barplot(cl)
  barplot(cl, bycluster=FALSE)

  ## plot the maximum instead of mean value per cluster:
  barplot(cl, bycluster=FALSE, data=iris[,-5],
          FUN=function(x) apply(x,2,max))

  ## use lattice for plotting:
  barchart(cl)
  ## automatic abbreviation of labels
  barchart(cl, scales=list(abbreviate=TRUE))

  ## Use manual labels. Note that the flexclust barchart orders bars
  ## from top to bottom (the default does it the other way round), hence
  ## we have to rev() the labels:
  LAB <- c("SL", "SW", "PL", "PW")
  barchart(cl, scales=list(y=list(labels=rev(LAB))))

[Package flexclust version 1.2-2 Index]