> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of bcrombie > Sent: Wednesday, July 10, 2013 12:19 PM > To: r-help@r-project.org > Subject: [R] create new matrix from user-defined function > > #Let's say I have the following data set: > > dat3 = data.frame(A_CaseID = c(1881, 1882, 1883, 1884, 1885), > B_MW_EEsDue1 = c(2, 2, 1, 4, 6), > C_MW_EEsDue2 = c(5, 5, 4, 1, 6), > D_MW_EEsDueTotal = c(7, 9, 5, 6, 112)) > dat3 > # A_CaseID B_MW_EEsDue1 C_MW_EEsDue2 D_MW_EEsDueTotal > # 1 1881 2 5 7 > # 2 1882 2 5 9 > # 3 1883 1 4 5 > # 4 1884 4 1 6 > # 5 1885 6 6 112 > > # I want to: > #CREATE A NEW 1-COLUMN MATRIX (of unknown #rows) LISTING ONLY "A"'s > WHERE "D > != B + C" > #THIS COLUMN CAN BE LABELED "MW_EEsDue_ERRORS", and output for this > example > should be: > > # MW_EEsDue_ERRORS > # 1 1882 > # 2 1884 > # 3 1885 > > #What is the best way to do this? Thanks for your time. BNC > >
Here is one option, there are many others. Only you can decide what is "best". data.frame(MW_EEsDue_ERRORS=dat3[dat3[[4]] != dat3[[2]]+dat3[[3]],][[1]]) Hope this is helpful, 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.
