generating integer sequences-CodePudding

How would I take the even values from 18 to 40 and repeat the sequence until I have 30 observations?

i.e. (18, 20, 22, 24, 26, 28, 30, 32, …40, 18, 20, 22, 24, …40, 18, …)

CodePudding user response：

We may use rep with seq i.e. seq to return the sequencees from 18 to 40 in intervals of 2 and then replicate the vector derived from seq to recycle till the length of the replicated vector reaches 30

rep(seq(18, 40, by = 2), length.out = 30)

Or as @I_O commented (there will be a warning message as the lengths are not the same)

integer(30)   9:20 * 2

-output

[1] 18 20 22 24 26 28 30 32 34 36 38 40 18 20 22 24 26 28 30 32 34 36 38 40 18 20 22 24 26 28

CodePudding user response：

A short alternative using modular math:

18   2 * (0:29 %% 12)
#>  [1] 18 20 22 24 26 28 30 32 34 36 38 40 18 20 22 24 26 28 30 32 34 36
#> [23] 38 40 18 20 22 24 26 28