Sergio Della Franca wrote: > Dear R-Helpers, > > I have the following data set(y): > > Years Products > 1 10 > 2 25 > 3 40 > 4 NA > 5 35 > <NA> 23 > 6 NA > 7 67 > 8 NA > > I want to create a new column into my dataset(y) under the following > conditions: > if years =NA and products >20 then new column=1 else new column=0; > to obtain the following results: > > Years Products New Column > 1 10 0 > 2 25 0 > 3 40 0 > 4 NA 0 > 5 35 0 > <NA> 23 1 > 6 NA 0 > 7 67 0 > 8 NA 0 >
How about using ifelse(): year = c(1,2,3,4,5,NA,6,7,8) products = c(10,25,40,NA,35,23,NA,67,NA) ifelse(is.na(year) & products>20,1,0) => [1] 0 0 0 0 0 1 0 0 0 Mark -- Dr. Mark Wardle Specialist registrar, Neurology Cardiff, UK ______________________________________________ R-help@stat.math.ethz.ch 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.
