Hello everybody, I have a list of over 9000 EntrezID . each lines contains one or probe-IDs as here: > head(probeSetList) $`10` [1] "38912_at" $`100` [1] "41654_at" "907_at" $`1000` [1] "2053_at" "2054_g_at" $`10000` [1] "40781_at" $`10001` [1] "35430_at" "35431_g_at" "35432_at" $`10002` [1] "31366_at" "31667_r_at" I would like to sort this list according to the length of the single vectors inside it. so to sayat the top are the ENTREZIDs with the largest number of probe IDs. (in my example $`10001` with 3, but I have some with more!). I tried with order and sort command, but that didn't work. I will be happy to hear some advices on how to do it. THX in advance Assa -- Assa Yeroslaviz Kockelsberg 22 51371 Leverkusen [[alternative HTML version deleted]]

On Fri, Jan 22, 2010 at 6:45 AM, Assa Yeroslaviz <frymor at="" gmail.com=""> wrote: > Hello everybody, > > I have a list of over 9000 EntrezID . each lines contains one or probe-IDs > as here: > >> head(probeSetList) > $`10` > [1] "38912_at" > > $`100` > [1] "41654_at" "907_at" > > $`1000` > [1] "2053_at" ? "2054_g_at" > > $`10000` > [1] "40781_at" > > $`10001` > [1] "35430_at" ? "35431_g_at" "35432_at" > > $`10002` > [1] "31366_at" ? "31667_r_at" > > > I would like to sort this list according to the length of the single vectors > inside it. so to sayat the top are the ENTREZIDs with the largest number of > probe IDs. (in my example $`10001` with 3, but I have some with more!). > > I tried with order and sort command, but that didn't work. > > I will be happy to hear some advices on how to do it. counts = sapply(probeSetList,length) head(probeSetList[order(counts)]) This is untested but will hopefully give you an idea. Sean

something like this should work... probeSetList <- probeSetList[order(unlist(lapply(probeSetList, length)))] Assa Yeroslaviz wrote: > Hello everybody, > > I have a list of over 9000 EntrezID . each lines contains one or probe-IDs > as here: > >> head(probeSetList) > $`10` > [1] "38912_at" > > $`100` > [1] "41654_at" "907_at" > > $`1000` > [1] "2053_at" "2054_g_at" > > $`10000` > [1] "40781_at" > > $`10001` > [1] "35430_at" "35431_g_at" "35432_at" > > $`10002` > [1] "31366_at" "31667_r_at" > > > I would like to sort this list according to the length of the single vectors > inside it. so to sayat the top are the ENTREZIDs with the largest number of > probe IDs. (in my example $`10001` with 3, but I have some with more!). > > I tried with order and sort command, but that didn't work. > > I will be happy to hear some advices on how to do it. > > THX in advance > > Assa