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for (i in 1:20) { df_i <- get(paste('df_', i, sep='')) length(which(df_i[,7]==1)) ###### } On Sat, Jan 9, 2010 at 7:57 PM, Zoho <ynp...@gmail.com> wrote: > > I've been stuck with this problem for a whole afternoon. It's silly but > totally pissed me off. I have a set of data frames with names in a > sequence: > df_1, df_2, df_3, ..., df_20. Now I want to access each data frame (read or > write) in a for loop, in a way something like this: > > for (i in 1:20) { > df_i <- ###### > length(which(df_i[,7]==1)) > ###### > } > > I tried paste or cat ("df_", i, sep=""). But neither way works. Your help > is > highly appreciated!! Thanks in advance! > -- > View this message in context: > http://n4.nabble.com/data-frame-names-in-sequence-tp1010518p1010518.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? [[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.