Look at the "missing" function. Or set the default value of the arguments to NA.
On Thu, Aug 29, 2013 at 3:23 PM, newruser12345 <smetc...@gelbergroup.com>wrote: > Hi All, > > I'm very green user and have little programming background, but appreciate > any and all help/direction. I have a spreadsheet that successfully sends > values from Excel cells to R as variables for a function, which then runs > and generates a plot. I cannot figure out how to make R recognize those > variables as NA if one of the cells in Excel is blank - or, for that > matter, > I don't know how to get an R function to recognize variables as NA if no > value is assigned to that variable. > > I have unsuccessfully tried using : > > if(is.na(four)) return(NA) > > My function is very simple: > > mtmatches <- c(one,two,three,four) > > Everything runs smoothly if the four variables have values assigned to > them. > Any advice on how to get it to run when one of the variables has no value? > No worries about the Excel element...figure I can decipher that puzzle > later! > > > Thanks! > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Omitted-blank-variables-in-R-function-tp4674931.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > -- Gregory (Greg) L. Snow Ph.D. 538...@gmail.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.
