如何在R中创建向量名称字符串，然后可以对其进行求值？

Question

In R, I currently have 100 dataframes, named df.1 , ..., df.100 . I would like to be able to rbind them but it is costly to write out:

rbind(df.1, df.2, etc)

So, I have tried:

rbind(eval(as.symbol(paste0("df.",1:84, collapse = ", "))))

However, this returns errors. Does anyone know how I can make the dataframes usable? thanks.

Answer 1

You can rbind them one at a time in a loop.

df.1 = iris
df.2 = iris
df.3 = iris

DF = df.1
for(i in 2:3) {
    DF = rbind(DF, eval(as.symbol(paste("df", i, sep=".")))) }

Answer 2

Using mget and then do.call or dplyr 's bind_rows should work.

df.1 = iris[1:20,]
df.2 = iris[21:50,]

do.call("rbind",mget(paste0("df.",1:2)))

library(dplyr)
bind_rows(mget(paste0("df.",1:2)))