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

Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

jquery - javascript onscroll fade same class but with different div -

i new @ javascript , want learn new. there wrong code : why div fades @ same time. i want ask how fade different div s same class name.can me , explain me. thanks in advance. javascript: $(window).scroll(function(){ if ($( "div.fade" ).offset().top - $(window).scrolltop() <= 100){ $('.fade').addclass( "fade-in"); } else { $('.fade').removeclass("fade-in"); } }); here jsfiddle onscroll = function () { var scrolltop = $(this).scrolltop() ; $("div.fade").each(function(){ if(($(this).offset().top - scrolltop) <= 100){ $(this).toggleclass("fade-in"); } }) }
Read more