Hello, 'sample' is a really bad name for a variable, it's already taken, it's an R function.
sample>1 && sample<5 # '&&' is not vectorized, it's '&' you want. # Without 'ifelse' raw.saliva.data$max.cort[index] <- raw.saliva.data$cortisol[index & sample > 1 & sample < 5] Negate this last conjunction if you want to set the other 'max.cort' to NA, !(index & sample > 1 & sample < 5) And, finally, this is untested. Give a small dataset example, including 'sample' (after calling it something else). Hope this helps, Rui Barradas la mer wrote > > Hello, > > I apologize in advance for not providing sample data, I'm a very new to R > and can't easily generate appropriate sample data quickly. I'm hoping > someone can offer advice without it. > > This code below works and does what I want it to do, which is for a given > row in my dataframe, where the variable "peak.cort" = max, it makes the > value of another variable "max.cort" = to match the value of a third > variable "cortisol" for that row. > > ************* > index <- raw.saliva.data$peak.cort == 'max' > raw.saliva.data$max.cort[index] <- > (raw.saliva.data$cortisol[index]) > ************* > > Now, I want to execute this function only if the value of a fourth > variable, "sample" is >1 and <5. I tried to add an ifelse statement to the > code above so that it looks like this: > > ************* > index <- raw.saliva.data$peak.cort == 'max' > raw.saliva.data$max.cort[index] <- ifelse(sample>1 && > sample<5, > raw.saliva.data$cortisol[index], NA) > ************* > > and I get this error: Error in sample > 1 : > comparison (6) is possible only for atomic and list types > > I can't figure out how to fix this problem. Any advice is appreciated. > > Thank you. > -- > *Melissa* > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@ 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. > -- View this message in context: http://r.789695.n4.nabble.com/trouble-with-ifelse-statement-tp4630309p4630316.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.
