Creating a new variable from a conditional operation on 3 old variables in R -

-

i have dataset in r, contains results of rapid diagnostic test. test has visible line if working (control line) , visible line each of 2 parasite species detects, if present in patient sample.

the dataset contains logical column each test line, follows: (database called rdtbase)

   control  pf    pv 1. true     true  false 2. true     false true 3. false    false false 4. true     true  true 5. true     false false

i add new column contains single result each rapid test. results designated according different logical conditions met 3 lines. example above new column this:

control  pf     pv     result 1. true  true   false  pf 2. true  false  true   pv 3. false false  false  invalid 4. true  true   true   mixed 5. true  false  false  negative

i able create new column, takes lot of coding , think there has simpler (and shorter) way this.

here current (long) method:

r.pf <- rdtbase[which(control == "true" & pf == "true" & pv == "false"),] r.pv <- rdtbase[which(control == "true" & pf == "false" & pv == "true"),] r.inv <- rdtbase[which(control == "false"),] r.mix <- rdtbase[which(control == "true" & pf == "true" & pv == "true"),] r.neg <- rdtbase[which(control == "true" & pf == "false" & pv == "false"),]  r.pf$result <- c("pf") r.pv$result <- c("pv") r.inv$result <- c("invalid") r.mix$result <- c("mixed") r.neg$result <- c("negative")  rdtbase2 <- rbind(r.pf, r.pv, r.inv, r.mix, r.neg)

any ideas on how simplify , shorten code appreciated, have kind of thing databases alot.

many thanks, amy

i create column of data frame , assign different subsets of conditionally. can slim down data frame indexing code. 

rdtbase$result = na  rdtbase <- within(rdtbase, result[control=="true" & pf=="true" & pv=="false"] <- "pf") rdtbase <- within(rdtbase, result[control=="false"] <- "invalid")

etc.

"within" saves little typing.


Comments

Post a Comment

Popular posts from this blog

c++ - Convert big endian to little endian when reading from a binary file -

-
this question has answer here: how convert between big-endian , little-endian values in c++? 28 answers i've been looking around how convert big-endian little-endians. didn't find solve problem. seem there's many way can conversion. anyway following code works ok in big-endian system. how should write conversion function work on little-endian system well? this homework, since systems @ school running big-endian system. it's got curious , wanted make work on home computer also #include <iostream> #include <fstream> using namespace std; int main() { ifstream file; file.open("file.bin", ios::in | ios::binary); if(!file) cerr << "not able read" << endl; else { cout << "opened" << endl; int i_var; double d_var; while(!file.eof()) {...
Read more

C#: Application without a window or taskbar item (background app) that can still use Console.WriteLine() -

-
i'm trying create application adheres following: no taskbar no console or form window can utilize console.writeline() . (i.e. if executes app command prompt write console.) the problem if create windows form (or wpf) application can have there no taskbar, console or window show up, console.writeline() nothing. if create console app, writes console, can't figure out how hide (and if did hide it, write command prompt window?)... how do this? just create standard console application. callers responsibility hide window caused program (from how run c# console application console hidden ): system.diagnostics.processstartinfo start = new system.diagnostics.processstartinfo(); start.filename = dir + @"\myprocesstostart.exe"; start.windowstyle = system.diagnostics.processwindowstyle.hidden;
Read more

unicode - Are email addresses allowed to contain non-alphanumeric characters? -

-
i'm building website using `django. website have significant users non-english speaking countries. i want know if there technical restrictions on types of characters email address contain. are email addresses allowed contain english alphabets, numbers, "_", "@" , "."? are allowed contain non-english alphabets "é" or "ü"? are allowed contain chinese or japanese or other unicode characters? email address consists of 2 parts local before @ , domain goes after. rules these parts different: for local part can use ascii: latin letters - z - z digits 0 - 9 special characters !#$%&'*+-/=?^_`{|}~ dot ., not first or last, , not in sequence space , "(),:;<>@[] characters allowed restrictions (they allowed inside quoted string, backslash or double-quote must preceded backslash) plus since 2012 can use international characters above u+007f , encoded as utf-8 . domain part more res...
Read more