grey.zones: Plot boxes to indicate areas of low sample size.
In davidcorton/archSeries: Tools for Chronological Uncertainty in Archaeology

Description Usage Arguments Value Examples

A utility function sometimes called by main archSeries plotting functions when dealing with output from cpue. Can in theory also be used alone after a call to axis.setup.

1	grey.zones(boxes, colours, opacity, ylim = 0)

`boxes`	A list resembling the third element of the output from a cpue call ("small.n").
`colours`	Character vector: colours to be used for boxes at each level of small sample. No default.
`opacity`	Numeric vector: opacity of boxes at each level of small sample. No default
`ylim`	Numeric: an easy way to override the built-in scaling in plot - if a vector of length 1 is passed it will be converted into c(0, ylim) to be passed to the ylim argument in plot. Alternatively a vector of length 2 will be passed straight to plot as is. Defaults to NULL, in which case the built-in scaling in plot takes over.

None.

dates <- data.table(Start=c(450, 450, 600), End=c(700, 800, 650), frags=c(3,6,2), vol=c(40, 40, 40))
x <- cpue(dates, dates, dates$frags, dates$vol, context.fields=NULL, small.n=1, reps=1000)
axis.setup(x)
grey.zones(x$small.n, "grey30", 200, ylim=130)