Identifying the particular X or Y in a sorted list
Hello, Shankar Lanke wrote
Dear All, I have a data sets as shown below A (Patient ID ), B and C are the Concentration of drug in blood on day 1 and day 4, D is the difference in conc. To do this in R I have written a code as follows, identified the number of patients who have more concentration on day 4 . Here I want to identify specifically the patient ID (is he patient 1 or 2 or 5 and 7), whose concentration is more. How to write a code to get the list of A (patient ID whose difference is more on day 4). Data<-(myDf$B-myDf$C) sum(Data>0) A B CD (B-C) 1 14 10 4 2 12 7 5 3 11 15 -4 4 8 3 5 5 1 8 -7 I appreciate your help, thank you very much in advance. Regards [[alternative HTML version deleted]]
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If I understand it correctly, this should do it. x <- read.table(text=" A B C D 1 14 10 4 2 12 7 5 3 11 15 -4 4 8 3 5 5 1 8 -7 ", header=TRUE) which(x$D == max(x$D)) x$A[ which(x$D == max(x$D)) ] Or you can save the values of the which() function and use them when needed. Hope this helps, Rui Barradas -- View this message in context: http://r.789695.n4.nabble.com/Identifying-the-particular-X-or-Y-in-a-sorted-list-tp4605124p4606062.html Sent from the R help mailing list archive at Nabble.com.