And (re: "dat[,ID]"), the page on "Extract or Replace Parts of an Object":
? Extract ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Rui Barradas Sent: Tuesday, January 17, 2017 5:51 AM To: PIKAL Petr <petr.pi...@precheza.cz>; Robert Piliero <robert.pili...@gmail.com>; r-help@r-project.org Subject: Re: [R] Receiving NaN message Hello, And in addition to what Jim and Petr said, take a look at ?%in%. Rui Barradas Em 17-01-2017 10:50, PIKAL Petr escreveu: > Hi > > And above what Jim adviced you should look also at > ?match > > help page. > > Cheers > Petr > >> -----Original Message----- >> From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Robert >> Piliero >> Sent: Monday, January 16, 2017 9:10 PM >> To: r-help@r-project.org >> Subject: [R] Receiving NaN message >> >> Hello, >> >> I am working on a Coursera assignment and have combined 332 files into a >> single data frame called "dat". The dataframe has 4 columns, >> >> 1. Date >> 2. Sulfate (numerical values) >> 3. Nitrate (numerical values) >> 4. ID # (numerical values). >> >> Our assignment is to write a function pollutantmean <- function(directory, >> pollutant, ID). whereby we can calculate the mean by inputting the pollutant >> name and ID #. >> >> I have reached the stage of subsetting the date e.g. by ID # 1-10, however >> when I do so and then calculate the mean of this subset I receive the NaN >> message (even though I have instructed R to disregard the "NA"'s). >> >> >> *Beginning Code: * >> getwd() >> read.csv(specdata) >> specdata <- ("C:/Users/rober/specdata") >> list.files(specdata) >> files_full <- list.files(specdata, full.names=TRUE) files_full dat <- >> data.frame() >> for (i in 1:332){ >> dat <- rbind(dat,read.csv(files_full[i])) >> } >> str(dat) >> mean(dat$sulfate, na.rm=TRUE) >> >> *Code which generated the NaN message. * >> dat1_10 <- dat[which(dat[,ID] ==1:10),] >> mean(dat1_10$sulfate, na.rm=TRUE) >> >> Am I making a mistake in subsetting the rows with ID's 1:10? Any advice >> would be appreciated. >> >> Thank you, >> >> Robert >> >> Robert J. Piliero >> >> Cell: (617) 283 1020 >> 38 Linnaean St. #6 >> Cambridge, MA, 02138 >> USA >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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. > > ________________________________ > Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou > určeny pouze jeho adresátům. > Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně > jeho odesílatele. 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