R All possible sub-combinations -

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i have data this:

basin <- c("volta","seine","limpopo") c1 <- c("ben","bel","sa") c2 <- c("burk","fra","moz") c3 <- c("ivc","lux","zim") c4 <- c("gha","na","bots") c5 <- c("mali","na","na") c6 <- c("togo","na","na") df <- data.frame(basin, c1, c2, c3, c4, c5, c6)      basin  c1  c2  c3   c4   c5   c6 1   volta ben bur ivc  gha mali togo 2   seine bel fra lux   na   na   na 3 limpopo  sa moz zim bots   na   na

each basin has k countries. example in first row, need generate combinations of 5 countries, combinations of 4 countries, , on. second row need generate combinations of 2 countries , third row combinations of 3 countries , 2countries. add these subsets new rows in data.

i tried use function:

    allsubs <- function(x, k) {   if(k > length(x)) stop('k > length(x)')   if(choose(length(x), k)==1){     list(as.vector(combn(x, k)))   } else {     cbn <- combn(x, k)     lapply(seq(ncol(cbn)), function(i) cbn[,i])   } }

however, can work if feed data this:

allsubs(c('ben','burk','ivc','gha','mali','togo'),4)

but need iterate through rows in data frame. appreciate help.

here 1 solution data follows (your input data still bit problematic , modified code generate correct data):

basin <- c("volta","seine","limpopo") c1 <- c("ben","bel","sa") c2 <- c("burk","fra","moz") c3 <- c("ivc","lux","zim") c4 <- c("gha",na,"bots") c5 <- c("mali",na,na) c6 <- c("togo",na,na) df <- data.frame(basin, c1, c2, c3, c4, c5, c6, stringsasfactors = false)      basin  c1   c2  c3   c4   c5   c6 1   volta ben burk ivc  gha mali togo 2   seine bel  fra lux <na> <na> <na> 3 limpopo  sa  moz zim bots <na> <na>  apply(df[, 2:7], 1, function(x) {l <- x[!is.na(x)]; sapply(seq(1:(length(l)-1)), function(y) combn(l, y))})

result various sub combinations of each country code per row. hope helps. of course, can split 'inline' function(s) used external functions invoke in apply call.


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