r - Drop factor levels containing single observation -


i'd know if there exists simple function (similar drop.levels) drop levels factor containing 1 observation. i'll provide reproducible example below. until i'm able store names of factors containing levels 1 observation, pain write code drop specific levels, there quick way it?

db0 <- data.frame(let = c(sample(letters[1:5], 99, replace = t),"z"),                   let2 = sample(letters[6:11], 100, replace = t))  #checking factor has levels 1 obs faclevels <- lapply(db0, table) facnames <- list() for(i in 1:length(faclevels)){   facnames[i]<-ifelse(min(faclevels[[i]])==1, names(faclevels[i]), na) } facnames <- as.character(facnames[!is.na(facnames)])

basically want drop z level in let. thanks.

the for loop here set factor level 1 observation na removes factor level column refactoring it.

db0 <- data.frame(let = c(sample(letters[1:5], 99, replace = t),"z"),   let2 = sample(letters[6:11], 100, replace = t))  #checking factor has levels 1 obs faclevels <- lapply(db0, table) # make list each factor level has 1 value to_change <- lapply(faclevels, function(x) names(x)[x==1])  for(i in 1:ncol(db0)){   if(length(to_change[[i]])>0){   # set na   db0[which(db0[,i] %in% to_change[[i]]),i] <- na   # removes factor level, remove code below if not   # wanted   db0[,i] <- as.factor(db0[,i])   } }  > tail(db0)      let let2 95     b    96        g 97     c    k 98     d    j 99     d    f 100 <na>    j  > levels(db0[,i]) [1] "f" "g" "h" "i" "j" "k"

Comments

Post a Comment

Popular posts from this blog

Command prompt result in label. Python 2.7 -

i want put result(output) of shell command label. command works, label shows "0", however, in command prompt, result shown correctly, need showed in label. doing ubuntu. myg1 = button(root, text="rodyti informacija", command=lambda: gauti()) myg1.pack(side=bottom) def gauti(): imti = tekstas.get("1.0", "end-1c") info = subprocess.call("id '{imti}' ".format(imti=imti), shell=true) w = label(root, text= info) w.pack(side = bottom) subprocess.call() returns exit code of process created (in case 0 success). if want text output of process, should instead call subprocess.check_output() .
Read more

javascript - How do I use URL parameters to change link href on page? -

i change href value of link using url parameters. example: default <a id="dlink" href="link-1">link</a> but, when user goes https://url.com/?dlink=link-2 it swaps out link new link <a id="dlink" href="link-2">link</a> first need value url. if you're not using javascript framework can create function using jquery. please check get url parameter jquery or how query string values in js it. after that, element "a" id , set value there. $("#dlink").attr("href", hreffromparam);
Read more

amazon web services - AWS Route53 Trying To Get Site To Resolve To www -

so have domain nameservers pointed aws route 53. site hosted on ec2 instance , reachable resolves site.com, if input www.site.com. i'm curious how site resolve www.site.com. have under route53 domains hosted zone 2 additional record sets outside of ns , soa: a site.com ec2 elastic ip cname www.site.com ec2 public dns i can reach site using both site.com , www.site.com, resolve site.com. there way make if enter either, resolves www.site.com? at first, both should record set. a site.com ec2 elastic ip www.site.com ec2 elastic ip and need redirect setting in web server (nginx, apache, ..) following. (source: how redirect www non-www nginx on centos 7 ) redirect non-www www if want redirect users plain, non-www domain www domain, add server block: server { server_name example.com; return 301 $scheme://www.example.com$request_uri; } save , exit. configures nginx redirect requests "example.com" "www.example.com". not...
Read more