prettyBreaks: Return "pretty" breaks for axis labelling.

In thegeologician/ggprovenance: Plotting of sediment provenance data, ggplot-style

Description

This function is similar to pretty_breaks in package scales, but has advanced options for log scales, forced range limits, and separate generation of major and minor ticks (useful for labelling).

Usage

prettyBreaks(range, inner = TRUE, logsc = FALSE, majors = TRUE,
  minors = FALSE, n.major = 8, n.minor = 0, force.limits = FALSE,
  frac.log = FALSE)

Arguments

range	Numeric vector of length 2 giving the min and max input values.
inner	TRUE: return only "pretty" ticks within range; FALSE: return ticks spanning closest "pretty" ticks outside range.
logsc	Boolean, return values suitable for labelling log-scale axes.
majors	Boolean, return major ticks.
minors	Boolean, return minor ticks.
n.major	(Approximate) number of major ticks to return.
n.minor	Number of minor ticks to return between each pair of major ticks.
force.limits	If inner = TRUE, also include exact range values.
frac.log	Use fractions of log10 (10^0.5, 10^0.33, 10^0.25), to closer match desired number of ticks.

Details

Setting major = FALSE, minor=TRUE can be useful to return minor ticks only, e.g. to plot them in a different style than major ticks.

Value

A numerical vector of generated breaks.

thegeologician/ggprovenance documentation built on Sept. 26, 2021, 8:59 a.m.