.in. {Hmisc} | R Documentation |
For two vectors or scalars a
and b
, a %in% b
returns a vector of logical values corresponding to the elements in
a
. A value is TRUE
if that element of a
is found
somewhere in b
, FALSE
otherwise. If a
is a factor
object and b
is numeric, converts a
to its integer codes
before the comparison. If a
is numeric and b
is
factor
, converts b
to codes. %nin%
returns
TRUE
if the element in a
is not in b
.
a %in% b a %nin% b
a |
a vector (numeric, character, factor) |
b |
a vector (numeric, character, factor), matching the mode of a |
vector of logical values with length equal to length of a
.
w <- factor(c("a","b","c")) w %in% c("b","c") w %in% c(2,3) #same as previous, but with warning #Suppose that a variable x has levels "a", "b1", "b2" and you #want to classify levels "b1" and "b2" as just "b". You can use #the %in% operator and do the following: # levels(x)[levels(x) %in% c("b1","b2")] <- "b" #Note that levels(x) <- list(b=c('b1','b2')) would be a better approach