R循环文件导入

Question

有没有办法循环这个？

jan2018 <- read.csv(file = 'Jan2018.csv')
feb2018 <- read.csv(file = 'Feb2018.csv')
mar2018 <- read.csv(file = 'Mar2018.csv')
apr2018 <- read.csv(file = 'Apr2018.csv')
may2018 <- read.csv(file = 'May2018.csv')
jun2018 <- read.csv(file = 'Jun2018.csv')
jul2018 <- read.csv(file = 'Jul2018.csv')
aug2018 <- read.csv(file = 'Aug2018.csv')
sep2018 <- read.csv(file = 'Sep2018.csv')

代码会是什么样子？

回答：

这是一个很好的示例，说明如何一次自动导入多个文件：

list_of_files <- list.files(pattern = "^starting_text")

data <- list_of_files %>%
  setNames(nm = c("jan", "feb", "mar", "apr", "may", "jun", "jul")) %>%
  map_df(read_xlsx, .id = "month")

Answer 1

试试这个：

file_names <- list.files(pattern = ".*2018.csv")
dates <- tolower(sub(".csv", "", file_names))

myList <- lapply(file_names, read.csv)


for (i in 1:length(myList)) {

  assign(paste0(dates[i]), as.data.frame(myList[[i]]))

}