[R] Count occurances in integers (or strings)
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 111. 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] Count occurances in integers (or strings)
If I understand you correctly, your data column is not a character. class(mydata[,my_column]) If it's numeric or a factor, this should work # convert it to character to split apart the individual digits # then convert the digits to numeric, and calculate the sum sapply(strsplit(as.character(mydata[, my_column]), ), function(x) sum(as.numeric(x))) Jean `·.,, (((º `·.,, (((º `·.,, (((º Jean V. Adams Statistician U.S. Geological Survey Great Lakes Science Center 223 East Steinfest Road Antigo, WI 54409 USA http://www.glsc.usgs.gov (GLSC web site) - Jay josip.2000 at gmail.com Wed Jun 15 11:09:25 CEST 2011 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 111. 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? [[alternative HTML version deleted]] __ 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.
Re: [R] Count occurances in integers (or strings)
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 111. 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.
