Replace specified values with new values, in a vector or factor.
Item in x that match items from will be replaced by
items in to, matched by position. For example, items in x that
match the first element in from will be replaced by the first
element of to.
mapvalues(x, from, to, warn_missing = TRUE)
x |
the factor or vector to modify |
from |
a vector of the items to replace |
to |
a vector of replacement values |
warn_missing |
print a message if any of the old values are
not actually present in |
If x is a factor, the matching levels of the factor will be
replaced with the new values.
The related revalue function works only on character vectors
and factors, but this function works on vectors of any type and factors.
revalue to do the same thing but with a single
named vector instead of two separate vectors.
x <- c("a", "b", "c")
mapvalues(x, c("a", "c"), c("A", "C"))
# Works on factors
y <- factor(c("a", "b", "c", "a"))
mapvalues(y, c("a", "c"), c("A", "C"))
# Works on numeric vectors
z <- c(1, 4, 5, 9)
mapvalues(z, from = c(1, 5, 9), to = c(10, 50, 90))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.