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2010 Jan 10
2
data frame names in sequence
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 appr...