What do the %op% operators in mean? For example “%in%”?

Question

I tried to do this simple search but couldn\'t find anything on the percent (%) symbol in R.

What does %in% mean in the following c

Answer 1

Put quotes around it to find the help page. Either of these work

> help("%in%")
> ?"%in%"

Once you get to the help page, you'll see that

‘%in%’ is currently defined as

‘"%in%" <- function(x, table) match(x, table, nomatch = 0) > 0’

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Since time is a generic, I don't know what time(X2) returns without knowing what X2 is. But, %in% tells you which items from the left hand side are also in the right hand side.

> c(1:5) %in% c(3:8)
[1] FALSE FALSE  TRUE  TRUE  TRUE

See also, intersect

> intersect(c(1:5), c(3:8))
[1] 3 4 5