使用 for 循环从列表中的 R 对象中提取信息

Question

I have a list of objects, where each object is a dataframe.

list_of_dfs<-(df1, df2, df3,....)

Suppose I want to extract information from the first column of each dataframe, say suppose extract all values of column 1 which is above 0.5, how do I use a for loop to do that?

Complication: It might be that each dataframe is only a "name" in the list_of_dfs however running the name itself in the console eg '>df1' would generate dataframe information.

Thanks for your consideration and advice.

Answer 1

If you first columns have all the same name, eg col_1 you could use a map to apply filter to all of them at once

library(tidyverse)
list_of_dfs <- (df1, df2, df3,....)
map(list_of_dfs, filter, col_1 > 0.5)
map(list_of_dfs, ~ filter(., col_1 > 0.5)) # equivalent