Pretty Breaks For date_xx Vectors

Source: R/scale_date_xx.R

date_*_breaks does not return breaks, but a function that calculates breaks. This is for compatibility with the breaks functions from scales such as scales::pretty_breaks(), and for ease of use with ggplot2.

date_yq_breaks(n = 6)

date_ym_breaks(n = 6)

date_yw_breaks(n = 6)

Arguments

n

NULL or integer scalar. The desired maximum number of breaks. The breaks algorithm may choose less breaks if it sees fit.

Value

a function that calculates a maximum of n breaks for a date_xx vector

Examples

x <- date_ym(2016, 1:12)
date_ym_breaks()(x)
#> [1] "2016-M01" "2016-M04" "2016-M07" "2016-M10"
date_ym_breaks(12)(x)
#>  [1] "2016-M01" "2016-M02" "2016-M03" "2016-M04" "2016-M05" "2016-M06"
#>  [7] "2016-M07" "2016-M08" "2016-M09" "2016-M10" "2016-M11" "2016-M12"