> -----Original Message----- > From: [email protected] [mailto:[email protected]] > On Behalf Of DimmestLemming > Sent: Saturday, July 09, 2011 10:31 AM > To: [email protected] > Subject: [R] Basic vector logic not working > > I am interning in a computer science lab and I'm very new to R. The > language > basics are clear, but this particular problem isn't: > > I have a very large dataframe called "data" which holds data from Halo > matches. I'm trying to analyze a certain window such that data$deaths>20 > and > data$deaths<=27. > > When I enter the line > > kills = data$kills[data$deaths>20] > > or any single condition, it selects the region I want. However, when I > input > > kills = data$kills[data$deaths>20 && data$deaths<=27] > > "kills" becomes the entire vector data$kills, without selecting any > specific > region. > > This is a simple problem, but I can't find anything wrong. How could I fix > it? >
You need to look at the difference between & and &&. & does position by position comparison, while && only considers the first element of each vector. For your purposes, I believe you should be using a single ampersand, &. Hope this is helpful, Dan Daniel Nordlund Bothell, WA USA ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
