This should work: mydata$my_column<-as.character(mydata$my_column) sum(unlist(strsplit(mydata[,"my_column"], "")) == "1")
On Wed, Jun 15, 2011 at 7:09 PM, Jay <josip.2...@gmail.com> wrote: > Hi, > > I have a dataframe column from which I want to calculate the number of > 1's in each entry. Some column values could, for example, be > "0001001000" and "11110000111". > > To get the number of occurrences from a string I use this: > sum(unlist(strsplit(mydata[,"my_column"], "")) == "1") > > However, as my data is not in string form.. How do I convert it? l > tried: > lapply(mydata[,"my_column"],toString) > > but I do not seem to get it right (or at least I do not understand the > output format). > > Also, are there other options? Can I easily calculate the occurrences > directly from the integers? > > ______________________________________________ > 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. > ______________________________________________ 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.
