处理ggplot2和for循环 [英] Dealing with ggplot2 and a for loop

问题描述

尊敬的StackOverflow社区，

Dear StackOverflow Community,

多年来，我一直在社区中寻求帮助.感谢那.现在我自己有一个问题:

For years I have been finding help in the community. Thanks for that. Now I have a question on my own:

我正在尝试使用for循环在列表中存储多个ggplot图.该代码运行时没有错误，但是只打印了最后一张图表中的数据.

I am trying to store multiple ggplot graphs in a list with a for loop. The code runs without an error, but only the data from the last graph are printed.

# Preparation
metr_var <- c("schneehoehe",
              "wind_richtung",
              "wind_vmittel",
              "wind_vmax",
              "temp",
              "luftfeuchtigkeit"
             )
# Generating List
plot_list <- list()

# For Loop
for (j in metr_var) {
     p = ggplot(data = NULL, aes_string(x = arfang$arfang, y = arfang[, j])) 
     + geom_boxplot() + ylab(j) + theme_bw()
     dev.new()
     plot_list[[which(metr_var == j)]] = print(p)
}

现在，如果我运行该代码，则仅打印 last ggplot命令中的aes.因此，每个图形都使用不同的y轴打印，但是数据保持不变.

Now, if I run that code, only the aes from the last ggplot command is printed. So each graph is printed with a different y-axis, but the data stays the same.

我知道它与ggplot和aes有关，但我只是不知道问题出在哪里.我搜索了整个StackOverflow，其他建议(打印，dev.new等)没有帮助.

I know it has something to do with the ggplot and aes, but I just ca't figure out what the problem is. I have searched the entire StackOverflow and the other suggestions (print, dev.new, etc.) did not help.

感谢任何帮助我的人.斯坦

Thanks for anyone helping me. Stan

推荐答案

您可以执行以下操作:

library(ggplot2)

vars <- c("mpg", "wt", "qsec")
plots <- list()

for (var in vars) {
  plots[[var]] <- ggplot(data=mtcars, aes_string(x=var)) + geom_histogram()
}

然后 l 将是一个包含3个 ggplot 的列表.如果要显示它们，可以执行以下操作:

Then l would be a list with 3 ggplot. If you want to display them, you can just do :

plots

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