Rename Dataframe Column Names in R using Previous Column Name and Regex Pattern -


i working in r first time , have been having difficulty renaming column names in dataframe (grade.data). have dataset imported csv file has column names this: student.id

grade      interactive.exercises.1..health  interactive.exercises.2..fitness  quizzes.1..week.1.quiz  quizzes.2..week.2.quiz  case.studies.1..case.study1  case.studies.2..case.study2

i able change variable names more simple, i.e. interactive.exercises.1.health interactive.exercises.1 or quizzes.1.week.1.quiz quizzes.1

so far, have tried this:

grep(".*[0-9]", names(grade.data))

but returned:

[1]  3  4  5  6  7  8  9 11 12 13 14 15 16 17 19 20 21 22 23 24 25

can me figure out going on, , write better regex expression? thank much.

it seems truncate column names after first chunk of digits.

you may use following sub solution:

names(grade.data) <- sub("^(.*?\\d+).*$", "\\1", names(grade.data))

see regex demo

details

  • ^ - start of string
  • (.*?\\d+) - group 1 (later referred \1 replacement pattern) matching 0+ chars few possible (.*?) , 1 or more digits (\d+)
  • .* - 0+ chars many possible
  • $ - end of string

Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more