r - How to aggregate data.table by applying two functions -


this question has answer here:

i have data.table lists user id, week number, fact user did (processed, either 0 or 1) , column use count how many values have, called howmany:

 data <- data.table(weeknumber=c(33,33,33,34,34,33,33,34,34),           user=c(1,1,1,1,1,2,2,2,2),           processed=c(1,1,0,0,1,0,1,0,1),          howmany=c(1,1,1,1,1,1,1,1,1))

i want find, each week, sum of things done , not done, this:

> dcast(setdt(data), weeknumber~processed, value.var="howmany", sum)     weeknumber 0 1 1:         33 2 3 2:         34 2 2

now i'd find average number of things done , not done week, in case have aggregate user before, fail @ step:

> dcast(setdt(data), weeknumber~processed+user, value.var="howmany", mean)    weeknumber 0_1 0_2 1_1 1_2 1:        33   1   1   1   1 2:        34   1   1   1   1

while optimal results be:

weeknumber 0   1         33 1 1.5         34 1   1

what this:

dat[, user_processed := paste(user, processed, sep="_")] dcast(dat, weeknumber~user_processed, value.var="processed", length)

which gives you:

   weeknumber 10001041_1 10001042_0 10001042_1 1:         33          0          3          2 2:         43          5          0          0

sample data used:

dat <- fread("user processed weeknumber   1: 10001042         0         33       2: 10001042         0         33       3: 10001042         1         33       4: 10001042         0         33       5: 10001042         1         33       870: 10001041         1         43       871: 10001041         1         43       872: 10001041         1         43       873: 10001041         1         43       874: 10001041         1         43")  dat <- dat[, v1 := null] setnames(dat, c("user", "processed", "weeknumber"))

Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more