> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > On Behalf Of Tuatara > Sent: Saturday, November 06, 2010 9:22 AM > To: r-help@r-project.org > Subject: [R] Using changing names in loop in R > > > Hello everybody, > > I have usually solved this problem by repeating lines of codes instead of > a > loop, but it's such a waste of time, I thought I should really learn how > to > do it with loops: > > What I want to do: > > Say, I have several data files that differ only in a number, e.g. data > points (or vector, or matrix...) Data_1, Data_2, Data_3,... and I want to > manipulate them > > e.g. a simple sum of several data points > > >data <- c(NA,n) > >for (i in 1:n){ > >data[i] <- Data_i + Data_[i-1] > > } > > I know that the above code doesn't work, and I don't want to combine the > files into one vector to solve the problem etc. - I would just like to > know > who make sure R recognizes the extension "_i". I have the same problem for > say, reading in datafiles that only differ by one digit in the extension, > and I want to (instead of repeating code) combine the process in a loop. > > I hope I made myself clear to what my problem is. > > Thanks for your help, >
This is one of those cases where a commented, self-contained, reproducible example would be very helpful in helping you. You mention you have several "data files", but I see no reference to data files in your code. Did you mean data frames? What is Data_i? A data frame or something else? You said you normally do this by repeating lines of code. Can you show us a simple example? Someone should be able to show you how to optimize it. Dan Daniel Nordlund Bothell, WA USA ______________________________________________ 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.
