Hello, You're right, sorry, I missed the parenthesis:
colordata$response <- (colordata$color == 'blue') + 0 Rui Barradas Quoting Michael Artz <michaelea...@gmail.com>: > Fyi, This statement returned the following error > 'Error in "Yes" + 0 : non-numeric argument to binary operator' > > > On Thu, Apr 7, 2016 at 8:43 AM, <ruipbarra...@sapo.pt> wrote: >> >> Hello, >> >> Or even simpler, without ifelse, >> >> colordata$response <- colordata$color == 'blue' + 0 >> >> Hope this helps, >> >> Rui Barradas >> >> >> Citando David Barron <dnbar...@gmail.com>: >>> >>> ifelse is vectorised, so just use that without the loop. >>> >>> colordata$response <- ifelse(colordata$color == 'blue', 1, 0) >>> >>> David >>> >>> On 7 April 2016 at 12:41, Michael Artz >>> <michaelea...@gmail.com> wrote: >>>> >>>> Hi I'm not sure how to ask this, but its a very easy question to >>>> answer for >>>> an R person. >>>> >>>> What is an easy way to check for a column value and >>>> then assigne a new >>>> column a value based on that old column value? >>>> >>>> For example, Im doing >>>> colordata <- data.frame(id = c(1,2,3,4,5), color = >>>> c("blue", "red", >>>> "green", "blue", "orange")) >>>> for (i in 1:nrow(colordata)){ >>>> colordata$response[i] <- >>>> ifelse(colordata[i,"color"] == "blue", 1, 0) >>>> } >>>> >>>> which works, but I don't want to use the for loop I >>>> want to "vecotrize" >>>> this. How would this be implemented? >>>> >>>> [[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. >>>> >>> [[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.htmland provide commented, >>> minimal, self-contained, reproducible code. >> >> >> >> >> > > > [[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.