Zoho 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!
>
df_1 <- data.frame(x1=3,x2=5)
df_2 <- data.frame(x1=2,x2=7)
df_3 <- data.frame(x1=-1,x2=1)
for(k in 1:3){v <- paste("df_",k,sep=""); print(get(v))}
for(k in 1:3){v <- paste("df",k,sep="_"); print(get(v)[,2])}
Have a look at get:
?get
Berend
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