将文件路径的数据帧复制到 R 中的新文件夹中

Question

I have a dataframe containing a bunch of file paths. I am trying to copy the files with these paths into a new folder. My attempt is file.copy(data1,"E:\\\\Contracts\\\\MainContracts") , where data1 is my dataframe and "E:\\Contracts\\MainContracts" is the path to the destination folder. 'from' path too long When I run this I get "'from' path too long". Does anyone know what I am doing wrong?

Answer 1

Here is a small example that will first write 3 files to your desktop in a folder called 'demo' and then copy all the files into another director on your desktop 'demo-copy'. We need to make sure we have either the full path names of the files to move or set the working directory to the folder they are in if not. Also file.copy takes a character vector in the 'from' argument so we need to pass column of file paths from the dataframe by indexing with the $ .

See if this example gives you an idea of the workflow:

library(purrr)
#create example data
data_to_save <- list(mtcars, iris, ToothGrowth)
filenames <- paste0('~/Desktop/demo/', c('mtcars', 'iris', 'ToothGrowth'), '.csv')
dir.create('~/Desktop/demo')
purrr::walk2(data_to_save, filenames, ~write.csv(.x, .y))

#copy all files to new folder
df_of_filenames <- data.frame(filename = list.files('~/Desktop/demo', pattern = '.csv', full.names = T))
dir.create('~/Desktop/demo-copy')
file.copy(df_of_filenames$filename, '~/Desktop/demo-copy/')