gbm.auto (version 2023.06.13)

breaks.grid: Defines breakpoints for draw.grid and legend.grid; mapplots fork

Description

Defines breakpoints from values in grd with options to exclude outliers, set number of bins, and include a dedicated zero column. Forked by SD 05/01/2019 to add 'lo', else bins always begin at 0, killing plotting when all data are in a tight range at high values e.g. 600:610

Usage

breaks.grid(grd, quantile = 0.975, ncol = 12, zero = TRUE)

Value

A vector of breakpoints for draw.grid in mapplots

Arguments

grd

An array produced by make.grid or a list produced by make.multigrid or a vector of positive values.

quantile

The maximum value of the breaks will be determined by the quantile given here. This can be used to deal with outlying values in grd. If quantile = 1 then the maximum value of the breaks will be the same as the maximum value in grd.

ncol

Number of colours to be used, always one more than the number of breakpoints. Defaults to 12.

zero

Logical, should zero be included as a separate category? Defaults to TRUE.

Author

Simon Dedman,

Hans Gerritsen

Examples

breaks.grid(100,ncol=6)
breaks.grid(100,ncol=5,zero=FALSE)

# create breaks on the log scale
exp(breaks.grid(log(10000),ncol=4,zero=FALSE))