Dan and Arun, thank you very much for your replies. They are both very helpful and I love to get different versions of an answer so I can learn more R code. You both used indexing to refer to the columns needed in the function, but since my real data frame will be much larger I'm assuming I can replace the index numbers with the names of the columns in quotes instead? I'll try this on my own if you're busy with other forum questions. Thanks, again.
From: Nordlund, Dan (DSHS/RDA) [via R] [mailto:ml-node+s789695n4671267...@n4.nabble.com] Sent: Wednesday, July 10, 2013 5:46 PM To: Crombie, Burnette N Subject: Re: create new matrix from user-defined function > -----Original Message----- > From: [hidden email]</user/SendEmail.jtp?type=node&node=4671267&i=0> > [mailto:r-help-bounces@r- > project.org<mailto:r-help-bounces@r-%20%0b%3e%20project.org>] On Behalf Of > bcrombie > Sent: Wednesday, July 10, 2013 12:19 PM > To: [hidden email]</user/SendEmail.jtp?type=node&node=4671267&i=1> > 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 ______________________________________________ [hidden email]</user/SendEmail.jtp?type=node&node=4671267&i=2> 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. ________________________________ If you reply to this email, your message will be added to the discussion below: http://r.789695.n4.nabble.com/create-new-matrix-from-user-defined-function-tp4671250p4671267.html To unsubscribe from create new matrix from user-defined function, click here<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4671250&code=YmNyb21iaWVAdXRrLmVkdXw0NjcxMjUwfC0xMzI5MzM0NzI3>. NAML<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> -- View this message in context: http://r.789695.n4.nabble.com/create-new-matrix-from-user-defined-function-tp4671250p4671361.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] ______________________________________________ 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.
