R remove multiple text strings in data.table -


i have vector of words remove data.table dt follows.

wordstoremove <- c("simpson", "flander", "nahasapeemapetilon", "spuckler", "wiggum")  dt <- structure(list(vid = c("simpsons", "flanders", "nahasapeemapetilons",                               "spucklers", "wiggums"), wr1 = c("homer simpson", "ned flanders",                                                                "apu nahasapeemapetilon", "cletus spuckler", "chief wiggum"),                       wr2 = c("bart simpson", "rod flanders", "manjula nahasapeemapetilon",                               "brandine spuckler", "ralph wiggum"), wr3 = c("marge simpson",                                                                             "todd flanders", "sanjay nahasapeemapetilon", na, "sarah wiggum"                              )), .names = c("vid", "wr1", "wr2", "wr3"), row.names = c(na,                                                                                         -5l), class = c("data.table", "data.frame"))  dt                    vid                    wr2                        wr2                       wr3 1:            simpsons          homer simpson               bart simpson             marge simpson 2:            flanders           ned flanders               rod flanders             todd flanders 3: nahasapeemapetilons apu nahasapeemapetilon manjula nahasapeemapetilon sanjay nahasapeemapetilon 4:           spucklers        cletus spuckler          brandine spuckler                        na 5:             wiggums           chief wiggum               ralph wiggum              sarah wiggum

i know can use solution in r remove multiple text strings in data frame.

how using data.table minimise copying of data?

try this:

library(data.table) foo <- function(x) gsub(paste0(wordstoremove, collapse="s?|"), "", x) dt[, names(dt)[-1] := lapply(.sd, foo), .sdcols = names(dt)[-1]] dt #                    vid     wr1       wr2     wr3 # 1:            simpsons  homer      bart   marge  # 2:            flanders    ned       rod    todd  # 3: nahasapeemapetilons    apu   manjula  sanjay  # 4:           spucklers cletus  brandine       na # 5:             wiggums  chief     ralph   sarah

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