R: Restrict a Colour Map to a Subset of Values

restrict.colourmap {spatstat.geom}

R Documentation

Restrict a Colour Map to a Subset of Values

Description

Given a colour map defined on a range of numerical values or a set of discrete inputs, the command restricts the range of values to a narrower range, or restricts the set of inputs to a subset, and returns the associated colour map.

Usage

restrict.colourmap(x, ..., range = NULL, breaks = NULL, inputs = NULL)

Arguments

`x`	Colour map (object of class `"colourmap"`).
`...`	Ignored.
`range`	New, restricted range of numerical values to which the colour map will apply. A numeric vector of length 2 giving the minimum and maximum values of the input. Incompatible with `breaks` and `inputs`.
`breaks`	Vector of breakpoints for the new colour map. A numeric vector with increasing entries. Incompatible with `range` and `inputs`.
`inputs`	Values accepted as inputs for the new colour map. A factor or vector. Incompatible with `breaks` and `range`.

Details

This command produces a new colour map y which is consistent with the original colour map x, except that y is defined on a narrower interval of numeric values, or a smaller set of discrete input values, than x.

Value

Colour map (object of class "colourmap").

Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au.

Examples

  plot(a <- colourmap(topo.colors(128), range=c(-1,1)))
  plot(b <- restrict.colourmap(a, range=c(0,1)))

[Package spatstat.geom version 3.3-2 Index]