将数据帧列表转换为一个数据帧
listOfDataFrames <- vector(mode = "list", length = 100)for (i in 1:100) {
listOfDataFrames[[i]] <- data.frame(a=sample(letters, 500, rep=T),
b=rnorm(500), c=rnorm(500))} df <- do.call("rbind", listOfDataFrames)
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