r - Unboxing List of lists as Data Frame columns elegantly -


i have data frame contains file name regular parts. use regex parse file name , store each part in own column. 

parse.file.name <- function(file.name="cc-nolabel-aemnz334_0009-loc-1317-407-6-39.png") {  rfn <- regexec(pattern="cc-(.+?)-(.+?)-loc-(.+?)-(.+?)-(.+?)-(.+?)\\.png", text=file.name) matchfn <- regmatches(file.name, rfn) return(matchfn) }  basic.features$parsed.filename <- parse.file.name(as.character(basic.features$filename))

filename contains values similar default parameter. i'm retrieving individual values each column following: 

 basic.features$label <- unlist(lapply(basic.features$parsed.filename,                                       function(pf) {                                          return(unlist(pf)[2]) } ))

i feel not elegant way couldn't manage individual values data frame column contains list in each row easily. there better way this?

if example data:

basic.features <- data.frame(filename=c("cc-nolabel-aemnz336_0009-loc-1003-1504-7-8.png", "cc-nolabel-aemnz335_0006-loc-1979-880-13-10.png", "cc-nolabel-aemnz333_0007-loc-941-263-8-8.png", "cc-nolabel-aemnz336_0014-loc-2011-24-4-4.png", "cc-nolabel-aemnz335_0013-loc-2087-644-66-41.png", "cc-nolabel-aemnz333_0013-loc-1531-374-12-23.png"))

it's simpler if use sapply:

basic.features$label <- sapply(basic.features$parsed.filename,function(x){x[2]})

however, if want turn parsed values data.frame in 1 shot, this:

df <- data.frame(t(sapply(basic.features$parsed.filename,function(x){x}))) colnames(df) <- c('filename','label','code1','code2','code3','code4','code5')  > df                                          filename   label         code1 code2 code3 code4 code5 1  cc-nolabel-aemnz336_0009-loc-1003-1504-7-8.png nolabel aemnz336_0009  1003  1504     7     8 2 cc-nolabel-aemnz335_0006-loc-1979-880-13-10.png nolabel aemnz335_0006  1979   880    13    10 3    cc-nolabel-aemnz333_0007-loc-941-263-8-8.png nolabel aemnz333_0007   941   263     8     8 4    cc-nolabel-aemnz336_0014-loc-2011-24-4-4.png nolabel aemnz336_0014  2011    24     4     4 5 cc-nolabel-aemnz335_0013-loc-2087-644-66-41.png nolabel aemnz335_0013  2087   644    66    41 6 cc-nolabel-aemnz333_0013-loc-1531-374-12-23.png nolabel aemnz333_0013  1531   374    12    23

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