You can use rbind as in your original post, but if you've got a mix of character and numeric data start with a data.frame rather than a matrix.
Michael On 11 November 2010 20:30, Noah Silverman <n...@smartmediacorp.com> wrote: > That makes perfect sense. > > Since I need to build up the results table sequentially as I iterate through > the data, how would you recommend it?? > > Thanks, > > -N > > On 11/11/10 12:03 AM, Michael Bedward wrote: >> >> All values in a matrix are the same type, so if you've set up a matrix >> with a character column then your numeric values will also be stored >> as character. That would explain why they are being converted to >> factors. It would also explain why your query isn't working. >> >> Michael >> >> >> On 11 November 2010 18:40, Noah Silverman<n...@smartmediacorp.com> wrote: >>> >>> That was a typo. >>> >>> It should have read: >>> results[results$one< 100,] >>> >>> It does still fail. >>> >>> There is ONE column that is text. So my guess is that R is seeing that >>> and >>> assuming that the entire data.frame should be factors. >>> >>> -N >>> >>> On 11/10/10 11:16 PM, Michael Bedward wrote: >>>> >>>> Hello Noah, >>>> >>>> If you set these names... >>>>> >>>>> names(results)<- c("one", "two", "three") >>>> >>>> this won't work... >>>>> >>>>> results[results$c< 100,] >>>> >>>> because you don't have a column called "c" (unless that's just a typo >>>> in your post). >>>> >>>>> I tried making it a data.frame with >>>>> foo<- data.frame(results) >>>>> >>>>> But that converted all the numeric values to factors!!! >>>> >>>> Not sure what's going on there. If 'results' is a numeric matrix you >>>> should get a data.frame with numeric cols since under the hood this is >>>> just calling the as.data.frame function. >>>> >>>> Michael >>>> >>>> >>>> >>>> >>>> >>>> On 11 November 2010 16:02, Noah Silverman<n...@smartmediacorp.com> >>>> wrote: >>>>> >>>>> Hi, >>>>> >>>>> I have a process in R that produces a lot of output. My plan was to >>>>> build >>>>> up a matrix or data.frame "row by row", so that I'll have a nice object >>>>> with >>>>> all the resulting data. >>>>> >>>>> I started with: >>>>> results<- matrix(ncol=3) >>>>> names(results)<- c("one", "two", "three") >>>>> >>>>> Then, when looping through the data: >>>>> results<- rbind(results, c(a,b,c)) >>>>> >>>>> This seems to work fine. BUT, my problem arises when I want to filter, >>>>> sort, >>>>> etc. >>>>> >>>>> I tried (thinking like a data.frame): >>>>> results[results$c< 100,] >>>>> >>>>> But that fails. >>>>> >>>>> I tried making it a data.frame with >>>>> foo<- data.frame(results) >>>>> >>>>> But that converted all the numeric values to factors!!! Which causes a >>>>> whole mess of problems. >>>>> >>>>> Any ideas?? >>>>> >>>>> -N >>>>> >>>>> ______________________________________________ >>>>> 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.