Hi,
I would like to use sweep to "sweep out" proportions and confidence intervals
for an array, however when I supply a function which returns a string
(containing something like "9% (3-18%)") I get back a list instead of an array,
here is a simplified example:
# example showing that sweep does not return an array with same dimensions as
STATS as advertised
string.fun <- function(a, b) {
paste(a, "-", b, sep="")
}
num.fun <- function(a, b) {
a+b/100
}
m <- array(seq(1:24), dim = c(2,3,4))
stat <- array(seq(1:12), dim = c(3,4))
string.ans <- sweep(m, c(2,3), stat, string.fun)
dim(string.ans)
length(string.ans)
num.ans <- sweep(m, c(2,3), stat, num.fun)
dim(num.ans)
Although the contents are correct, strings.ans is a list while num.ans is an
array. Help(sweep) says that the result of sweep should have the same
dimensions as x, however when the result of the function is a string this is
not the case. How can I coerce the result of the function to cause sweep to
return an array as advertised?
thanks,
Peter
Peter Young, MPH
Surveillance Epidemiologist
CDC Mozambique
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