Skip observations

Skip observations

JumpBy(x, by, start = 1, fill = NULL)

Arguments

x

vector

by

numeric interval between elements to keep

start

index to start from

fill

how observations are skipped

Value

A vector of the same class as x and, if fill is not null, the same length.

Details

Mostly useful for labelling only every byth element.

See also

Other utilities: Anomaly(), Mag(), Percentile(), logic

Examples

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