> -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Daniel Nordlund > Sent: Friday, August 07, 2009 2:50 PM > To: r-help@r-project.org > Subject: Re: [R] Seeing negative numbers to zero > > > -----Original Message----- > > From: r-help-boun...@r-project.org > > [mailto:r-help-boun...@r-project.org] On Behalf Of DebbieMB > > Sent: Friday, August 07, 2009 1:29 PM > > To: r-help@r-project.org > > Subject: [R] Seeing negative numbers to zero > > > > > > Hi, > > > > I am also new to R and I have a related question. I am > trying to set > > negative values in a single column of a dataframe to zero and > > I can't seem > > to do it. > > > > I have tried: > > KN1<-subset(KN,select=c(5)) > > # Here I am selecting the column of the dataframe KN1 and > > assigning it the > > name KN2 - this step works > > KN2<-ifelse(KN1<=0,0,KN1) > > # Here I am trying to set negative numbers to zero and > leave all other > > numbers the same - this doesn't work > > > > Any help would be appreciated. > > > > Thanks, > > Debbie > > Debbie, > > When you say it doesn't work, what does that mean? Do you get an error > message? Are you left with negative numbers? What? A minimal, > self-contained, reproducible example would help us help you. > > > KN1 <- rnorm(100) > > KN2 <- ifelse(KN1 < 0, 0, KN1) > > Works fine for fine for me.
Mark Leeds kindly pointed out to me offline that Debbie's KN1 would be a data frame and my solution doesn't work. I don't know whether KN1 and KN2 need to be data frames or whether vectors would work. If a vector is ok then how about > KN1 <- KN[[5]] > KN2 <- ifelse(KN1 < 0, 0, KN1) > KN2 Hope this is helpful, Dan Daniel Nordlund Bothell, WA USA ______________________________________________ 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.
