R: Vectorize a scalar function to work on any R object.
vectorize
R Documentation
Vectorize a scalar function to work on any R object.
Description
Robust alternative to Vectorize function that accepts any function with two
or more arguments. Returns a function that will work an arbitrary number of vectors, lists or
data frames, though output may be unpredicatable in unusual applications. The
results are also intended to be more intuitive than Vectorize.
Usage
vectorize(fun, type = NULL)
Arguments
fun
a two or more argument function
type
like MARGIN in apply, except that c(1,2) is
represented as a 3 instead. By default, will Reduce single dimensional
data handle everything else row-wise.
Examples
vectorize(`+`)(c(1,2,3))
vectorize(sum)(c(1,2,3),c(1,2,3))
# Compare these results to Vectorize, which does not vectorize sum at all.
Vectorize(sum)(c(1,2,3),c(1,2,3))
# Across data frame columns.
df<-data.frame(a=c(1,2,3),b=c(1,2,3))
vectorize(sum)(df$a,df$b)
# Once again, Vectorize gives a different result
Vectorize(sum)(df$a,df$b)
# Any combination of vectors, lists, matrices, or data frames an be used.
vectorize(`+`)(c(1,2,3),list(1,2,3),cbind(c(1,2,3)))
providing 
.