recode {car} | R Documentation |
Recodes a numeric vector, character vector, or factor
according to simple recode specifications. Recode
is an alias for recode
that avoids name clashes
with packages, such as Hmisc, that have a recode
function.
recode(var, recodes, as.factor.result, as.numeric.result=TRUE, levels) Recode(...)
var |
numeric vector, character vector, or factor. |
recodes |
character string of recode specifications: see below. |
as.factor.result |
return a factor; default is |
as.numeric.result |
if |
levels |
an optional argument specifying the order of the levels in the returned factor; the default is to use the sort order of the level names. |
... |
arguments to be passed to |
Recode specifications appear in a character string, separated by
semicolons (see the examples below), of the form input=output
.
If an input value satisfies more than one specification,
then the first (from left to right) applies.
If no specification is satisfied, then the input value is carried
over to the result. NA
is allowed on input and output.
Several recode specifications are supported:
For example, 0=NA
.
For example, c(7,8,9)='high'
.
For example, 7:9='C'
. The special values lo
and hi
may appear in a range. For example, lo:10=1
. Note: :
is
not the R sequence operator.
else
everything that does not fit a previous specification.
For example, else=NA
. Note that else
matches all otherwise
unspecified values on input, including NA
.
If all of the output values are numeric, and if as.factor.result
is
FALSE
, then a numeric result is returned; if var
is a factor,
then by default so is the result.
a recoded vector of the same length as var
.
John Fox jfox@mcmaster.ca
Fox, J. and Weisberg, S. (2011) An R Companion to Applied Regression, Second Edition, Sage.
x<-rep(1:3,3) x ## [1] 1 2 3 1 2 3 1 2 3 recode(x, "c(1,2)='A'; else='B'") ## [1] "A" "A" "B" "A" "A" "B" "A" "A" "B" Recode(x, "1:2='A'; 3='B'") ## [1] "A" "A" "B" "A" "A" "B" "A" "A" "B"