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Default Panel Function for parallelplot

panel.parallel.Rd

This is the default panel function for parallelplot.

Usage

panel.parallel(x, y, z, subscripts,
               groups = NULL,
               col, lwd, lty, alpha,
               common.scale = FALSE,
               lower,
               upper,
               ...,
               horizontal.axis = TRUE,
               identifier = "parallel")

Arguments

x, y

dummy variables, ignored.

z

The data frame used for the plot. Each column will be coerced to numeric before being plotted, and an error will be issued if this fails.

subscripts

The indices of the rows of z that are to be displyed in this panel.

groups

An optional grouping variable. If specified, different groups are distinguished by use of different graphical parameters (i.e., rows of z in the same group share parameters).

col, lwd, lty, alpha

graphical parameters (defaults to the settings for superpose.line). If groups is non-null, these parameters used one for each group. Otherwise, they are recycled and used to distinguish between rows of the data frame z.

common.scale

logical, whether a common scale should be used columns of z. Defaults to FALSE, in which case the horizontal range for each column is different (as determined by lower and upper).

lower, upper

numeric vectors replicated to be as long as the number of columns in z. Determines the lower and upper bounds to be used for scaling the corresponding columns of z after coercing them to numeric. Defaults to the minimum and maximum of each column. Alternatively, these could be functions (to be applied on each column) that return a scalar.

...

other arguments (ignored)

horizontal.axis

logical indicating whether the parallel axes should be laid out horizontally (TRUE) or vertically (FALSE).

identifier

A character string that is prepended to the names of grobs that are created by this panel function.

Details

Produces parallel coordinate plots, which are easier to understand from an example than through a verbal description. See example for parallelplot.

The parallelplot function was historically called parallel following the Trellis implementation is S-PLUS. It has been renamed to avoid conflicts with the parallel package which supports parallel computation in R. The name of the default panel function, however, has remained unchanged.

References

Inselberg, Alfred (2009) Parallel Coordinates: Visual Multidimensional Geometry and Its Applications, Springer. ISBN: 978-0-387-21507-5.

Inselberg, A. (1985) “The Plane with Parallel Coordinates”, The Visual Computer.

Author

Deepayan Sarkar Deepayan.Sarkar@R-project.org

See also

parallelplot