使用purrr :: map将多个数据帧写入csv文件 [英] Write multiple data frames to csv-file using purrr::map

问题描述

问题:

我有一个数据帧列表，应该以csv文件的形式写入磁盘.

I have a list of dataframes which should be written to disk as csv-files.

假设这是数据帧的列表:

Assume this is the list of data frames:

dfs <- list(iris,
            mtcars)

不起作用的地方

我试图像这样构建正确的文件名，但是没有用:

I have tried to build the correct file names like this, but it did not work:

dfs %>% 
  map(~paste0("data-raw/", ., ".csv"))

我希望此位可以正确地将文件名作为字符串返回.而是，map将每个列和每个值匹配到paste0调用.

I hoped that this bit would correctly give back the file names as strings. Instead, map matched each column and each value to the paste0 call.

我也尝试了deparse(substitute(.))技巧，但是在map调用中无法正确识别..

I also tried the deparse(substitute(.)) trick, but the . was not reckognized correctly in the map call.

下一步是将数据帧(dfs的元素)写为csv文件.

The next step would be to write the data frames (elements of dfs) as csv-files.

问题:

如何使用purrr::map(或类似方法)使用write_csv将每个数据帧(dfs的每个元素)作为csv文件写入磁盘?

How can I use purrr::map(or a similar appraoch) to write each data frame (each element of dfs) as csv-file to disk using write_csv?

推荐答案

尝试一下.

list(iris = iris, mtcars = mtcars) %>%
  names(.) %>%
  map(~ write_csv(dfs[[.]], paste0("data-raw/", ., ".csv")))

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