> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Yanyuan Zhu > Sent: Thursday, December 20, 2012 7:48 AM > To: r-help@r-project.org > Subject: [R] an entry level (stupid) question > > Hello all, i'm a newbie to R and now I get stuck by the question, would > anybody help me please? > > Suppose, I got the following > > > test <- data.frame(test1=c(c(0.00, 0.005, 0.01, 0.015, 0.02))) > > test > test1 > 1 0.000 > 2 0.005 > 3 0.010 > 4 0.015 > 5 0.020 > > Now I want another column inside test, named test2 > for i=c(1:5), If test$test1[i] is 0, then the value of test$test2[i] is > 1/test1[i] > or else If test$test1[i] is not 0, then the value of test$test2[i] is > 39 > > how should i programme in R to make it happen? > > thanks a lot! >
You probably want to use the ifelse() function, but your description of the problem change zeros into inf (i.e. infinity) and all other values into 39. Is that what you really want? Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
