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我正在尝试使用 ggplot2 在同一个图上绘制多个图层（大约 100 个）。为此，我创建了一个数据框，其中包含根据“i”分配的数据。

rm(list = ls())
# file directory
setwd("E:/stage/Flight_Data/Flight_Data/0200")

library(ggplot2)

# to read txt files
liste_fichier <- list.files("./", pattern=".txt")
n <- length(liste_fichier)

times = list();
altitudes = list();
dataframes = list();

# loop to read the files
for (i in 1:n) {
  fichier = liste_fichier[i]
  smp <- read.table(fichier, header=FALSE, sep="", skip=3, fill=TRUE)
  names(smp) <- c("Date","Time", "Latitude", "Longitude", "Baro.Altitude", 
                  "Radio.Altitude", "Pressure", "A340.static.T", "A340.air.speed",
                  "A340.ground.speed", "zonal.wind", "meridian.wind", "ozone.vmr",
                  "H2O.static.T", "relative.humidity", "RH.validity", "RH.accuracy",
                  "H2O.mmr","CO.vmr", "NOy.vmr", "NO.vmr", "NOx.vmr",
                  "NOy.uncertainty", "NOy.validity")
  smp$ultratime <- strptime(paste(smp$Date, sprintf("%06d",strtoi(smp$Time)), sep=" "), 
                            format="%Y%m%d %H%M%S")

  dataframes[[i]] <- data.frame(smp$ultratime,smp$Baro.Altitude)

  # Here I want to plot all the files in the same graph, first i want to try only 2

  print(ggplot(NULL, aes(x=smp$ultratime, y=smp$Baro.Altitude)) +
     geom_line(data=dataframes[[1]])+geom_line(data=dataframes[[2]]))
}

我可以为数据帧 [[1]] 绘制一个图层，但是当我添加更多时，我收到以下错误：

Error in dataframes[[2]] : subscript out of bounds
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