List of data in R -


i manage data in 3 different classes - tbl_df, tbl, , data.frame - reasons.

what try make list of several data belows:

data1 tbl_df, tbl, , data.frame. data2 tbl_df, tbl, , data.frame. data3 tbl_df, tbl, , data.frame.  list[1] means data1 list[2] means data2 list[3] means data3

however, surprised realised hard find how this. i'd appreciate have answer this. thanks.

when coerce data.frame tbl_df dplyr package, object receives 2 more class designations, namely tbl_df , tbl.

library(dplyr) class(tbl_df(data.frame(x = runif(5), y = runif(5)))) [1] "tbl_df"     "tbl"        "data.frame"

they more or less same data.frames, little difference when comes printing. ?tbl_df:

the main advantage using tbl_df on regular data frame printing: tbl objects print few rows , columns fit on 1 screen, describing rest of text.

bottom line can use object of class tbl_df, tbl , data.frame data.frame`.

if mean calculate mean of whole data set, perhaps better structure matrix?

in case, in below example calculate means of columns , store result in list. example can optimized using sapply , lapply functions.

library(dplyr) data1 <- tbl_df(data.frame(x = runif(5), y = runif(5))) data2 <- tbl_df(data.frame(x = runif(5), y = runif(5))) data3 <- tbl_df(data.frame(x = runif(5), y = runif(5)))  list.of.dfs <- ls(pattern = "data")  list.of.means <- vector("list", 3) names(list.of.means) <- list.of.dfs  (i in list.of.dfs) {   my.df <- get(i)   list.of.means[[i]] <- colmeans(my.df) }  > list.of.means $data1         x         y  0.4895666 0.4219187   $data2         x         y  0.4100487 0.2763898   $data3         x         y  0.6123135 0.5033225

Comments

Post a Comment

Popular posts from this blog

php - failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request -

this code i'm using find latitude , longitude of place: function coords($address){ echo $url="http://maps.googleapis.com/maps/api/geocode/json?address=".$address; $json = file_get_contents(urlencode($url)); $data = json_decode($json, true); print_r($data['results'][0]['geometry']['location']['lat']); print_r($data['results'][0]['geometry']['location']['lng']); } however returns warning: failed open stream: http request failed! http/1.0 400 bad request if use above code in simple procedure works fine not in function. note: have tried curl_init()... method produced same result? instead of encoding whole url encode address part. following code work fine $add='jamshoro phase 2'; $url="http://maps.googleapis.com/maps/api/geocode/json?address=".urlencode($add); $json = file_get_contents($url); $data = json_decode($json, true); print_r($data['r
Read more

java - How to filter a backspace keyboard input -

i have code gives message when key number pressed: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochararray().length - 1]; if (!(ch >= '0' && ch <= '9')) { system.out.println("the char entered not number"); t.consume(); } } }); now if press on wrong button , press backspace remove it, error message. how can add backspace input if statement? i have found answer: txtvalueofclause.addeventfilter(keyevent.key_typed, new eventhandler<keyevent>() { @override public void handle(keyevent t) { char ar[] = t.getcharacter().tochararray(); char ch = ar[t.getcharacter().tochar
Read more

java - Show Soft Keyboard when EditText Appears -

i have code in android app, alert dialog , keyboard, , when dialog shown want keyboard appear. not , not sure why? here code: final alertdialog.builder alert = new alertdialog.builder(this); alert.settitle("title"); alert.setmessage("message"); final edittext input = new edittext(this); input.setinputtype(inputtype.type_class_number); alert.setview(input); input.setonfocuschangelistener(new view.onfocuschangelistener() { @override public void onfocuschange(view v, boolean hasfocus) { if (hasfocus) { log.i(tag, "in focus"); inputmethodmanager inputmethodmanager = (inputmethodmanager) getsystemservice(context.input_method_service); inputmethodmanager.showsoftinput(input, inputmethodmanager.show_implicit); } } }); but keyboard not appear though edit text in focus, , tell appear why, doesn't come up? thanks in advance.
Read more