Creates an evenly spaced, pretty sequence of numbers for a range of a vector.
pretty_range(x, n = NULL, length = NULL)A numeric vector.
Numeric value, indicating the size of how many values are used to
create a pretty sequence. If x has a large value range (> 100),
n could be something between 1 to 5. If x has a rather
small amount of unique values, n could be something between
10 to 20. If n = NULL, pretty_range() automatically
tries to find a pretty sequence.
Integer value, as alternative to n, defines the number of
intervals to be returned.
A numeric vector with a range corresponding to the minimum and
maximum values of x. If x is missing, a function,
pre-programmed with n and length is returned. See examples.
data(iris)
# pretty range for vectors with decimal points
pretty_range(iris$Petal.Length)
#> [1] 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
# pretty range for large range, increasing by 50
pretty_range(1:1000)
#> [1] 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700
#> [16] 750 800 850 900 950 1000
# increasing by 20
pretty_range(1:1000, n = 7)
#> [1] 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280
#> [16] 300 320 340 360 380 400 420 440 460 480 500 520 540 560 580
#> [31] 600 620 640 660 680 700 720 740 760 780 800 820 840 860 880
#> [46] 900 920 940 960 980 1000
# return 10 intervals
pretty_range(1:1000, length = 10)
#> [1] 0 100 200 300 400 500 600 700 800 900 1000
# same result
pretty_range(1:1000, n = 2.5)
#> [1] 0 100 200 300 400 500 600 700 800 900 1000
# function factory
range_n_5 <- pretty_range(n = 5)
range_n_5(1:1000)
#> [1] 0 50 100 150 200 250 300 350 400 450 500 550 600 650 700
#> [16] 750 800 850 900 950 1000