Tobias I remember finding Patrick Burns' "S Poetry" (see http://www.burns-stat.com/ ) worth reading - and it covers this sort of thing nicely.
Peter Alspach >>> Tobias Muhlhofer <[EMAIL PROTECTED]> 02/12/04 13:57:47 >>> Thanks. The problem is that there is extremely little on dataframes or matrices in "An Intro to R", which I did read and I frankly don't know where else to go. Once I know a function like subset() exists, I can then read the help files on it and that's fine, but I would never dream this function up myself... As for indexing, I DID read "An Introduction to R" and I did NOT catch the part where it says you can use any variable in the dataframe to index it, nor would I have thought of it by myself. From that documentation, I only learned about using row-labels to index things... But I am definitely thankful for the quick help given to me by people on this list, and so I guess being RTFM'ed is a small price to pay for figuring out how to solve the problem I need to solve. Toby Jeff Laake wrote: > Here's an example: > > earlydata=data[data$year<1960,] > > Lookup help and read manuals on manipulating dataframes. > > > Tobias Muhlhofer wrote: > >> Hi! >> >> Sorry for asking a trivial questions, but I can't seem to figure this >> out. >> >> I have a dataframe called master containing 30-odd variables. >> >> In this dataframe, I have observations across these 30 variables from >> 1930 to 2003 (I've made a "year" variable). How can I drop all rows >> for which the year is less than 1960? I'm assuming something with >> ifelse() but I can't quite figure it out. >> >> I would appreciate a suggestion of some syntax. >> >> Thanks! >> Toby >> >> ______________________________________________ >> [EMAIL PROTECTED] mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide! >> http://www.R-project.org/posting-guide.html > > > > > -- ************************************************************************** When Thomas Edison invented the light bulb he tried over 2000 experiments before he got it to work. A young reporter asked him how it felt to have failed so many times. He said "I never failed once. I invented the light bulb. It just happened to be a 2000-step process." ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________________ The contents of this e-mail are privileged and/or confidenti...{{dropped}} ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
