Skip observations
JumpBy(x, by, start = 1, fill = NULL)vector
numeric interval between elements to keep
index to start from
how observations are skipped
A vector of the same class as x and, if fill is not null,
the same length.
Mostly useful for labelling only every byth element.
Other utilities:
Anomaly(),
Mag(),
Percentile(),
logic
x <- 1:50
JumpBy(x, 2) # only odd numbers
#> [1] 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49
JumpBy(x, 2, start = 2) # only even numbers
#> [1] 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
JumpBy(x, 2, fill = NA) # even numbers replaced by NA
#> [1] 1 NA 3 NA 5 NA 7 NA 9 NA 11 NA 13 NA 15 NA 17 NA 19 NA 21 NA 23 NA 25
#> [26] NA 27 NA 29 NA 31 NA 33 NA 35 NA 37 NA 39 NA 41 NA 43 NA 45 NA 47 NA 49 NA
JumpBy(x, 2, fill = 6) # even numbers replaced by 6
#> [1] 1 6 3 6 5 6 7 6 9 6 11 6 13 6 15 6 17 6 19 6 21 6 23 6 25
#> [26] 6 27 6 29 6 31 6 33 6 35 6 37 6 39 6 41 6 43 6 45 6 47 6 49 6