shingles {lattice}R Documentation



Functions to handle shingles


shingle(x, intervals=sort(unique(x)))
equal.count(x, ...)

## S3 method for class 'shingle':
plot(x, panel, xlab, ylab, ...)

## S3 method for class 'shingle':
print(x, showValues = TRUE, ...)

## S3 method for class 'shingleLevel':
as.character(x, ...)

## S3 method for class 'shingleLevel':
print(x, ...)

## S3 method for class 'shingle':
summary(object, showValues = FALSE, ...)

## S3 method for class 'shingle':
x[subset, drop = FALSE]
as.factorOrShingle(x, subset, drop)


x numeric variable or R object, shingle in plot.shingle and x[]. An object (list of intervals) of class "shingleLevel" in print.shingleLevel
object shingle object to be summarized
showValues logical, whether to print the numeric part. If FALSE, only the intervals are printed
intervals numeric vector or matrix with 2 columns
subset logical vector
drop whether redundant shingle levels are to be dropped
panel, xlab, ylab standard Trellis arguments (see xyplot )
... other arguments, passed down as appropriate. For example, extra arguments to equal.count are passed on to co.intervals. graphical parameters can be passed as arguments to the plot method.


A shingle is a data structure used in Trellis, and is a generalization of factors to ‘continuous’ variables. It consists of a numeric vector along with some possibly overlapping intervals. These intervals are the ‘levels’ of the shingle. The levels and nlevels functions, usually applicable to factors, also work on shingles. The implementation of shingles is slightly different from S.

There are print methods for shingles, as well as for printing the result of levels() applied to a shingle. For use in labelling, the as.character method can be used to convert levels of a shingle to character strings.

equal.count converts x to a shingle using the equal count algorithm. This is essentially a wrapper around co.intervals. All arguments are passed to co.intervals.

shingle creates a shingle using the given intervals. If intervals is a vector, these are used to form 0 length intervals.

as.shingle returns shingle(x) if x is not a shingle.

is.shingle tests whether x is a shingle.

plot.shingle displays the ranges of shingles via rectangles. print.shingle and summary.shingle describe the shingle object.


x$intervals for levels.shingle(x), logical for is.shingle, an object of class "trellis" for plot (printed by default by print.trellis), and an object of class "shingle" for the others.


Deepayan Sarkar

See Also

xyplot, co.intervals, Lattice


z <- equal.count(rnorm(50))

[Package lattice version 0.15-4 Index]