RosettaCodeData/Task/Power-set/R/power-set-2.r

15 lines
486 B
R

powerset <- function(set){
ps <- list()
ps[[1]] <- numeric() #Start with the empty set.
for(element in set){ #For each element in the set, take all subsets
temp <- vector(mode="list",length=length(ps)) #currently in "ps" and create new subsets (in "temp")
for(subset in 1:length(ps)){ #by adding "element" to each of them.
temp[[subset]] = c(ps[[subset]],element)
}
ps <- c(ps,temp) #Add the additional subsets ("temp") to "ps".
}
ps
}
powerset(1:4)