mapStats (version 2.3)

jiggleClass: Adjust class boundaries to protect from rounding errors

Description

When using classIntervals to compute classes, occasionally there are rounding errors so that when the data is plotted and the class breaks are used for colors, for instance, the rounding error may cause a value to not be plotted with the right color, or to not be plotted at all. For this reason, we add a small value to each of the break points to accomodate a possible rounding error. This correction is negligible and should not affect plotting.

Usage

jiggleClass(x)

Arguments

x

an object of class classIntervals from the function classIntervals.

Value

• an object of class classIntervals.

Examples

y <- 100*rnorm(50)

#compute class intervals
class_list <- classInt::classIntervals(var=y, n=12, style="jenks")
class_list$brks

#there should be a slight difference now between class breaks
class_list <- jiggleClass(x=class_list)
class_list$brks