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.
restrict.colourmap(x, ..., range = NULL, breaks = NULL, inputs = NULL)Colour map (object of class "colourmap").
Colour map (object of class "colourmap").
Ignored.
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.
Vector of breakpoints for the new colour map.
A numeric vector with increasing entries.
Incompatible with range and inputs.
Values accepted as inputs for the new colour map.
A factor or vector.
Incompatible with breaks and range.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au.
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.
colourmap
plot(a <- colourmap(topo.colors(128), range=c(-1,1)))
plot(b <- restrict.colourmap(a, range=c(0,1)))
Run the code above in your browser using DataLab