Using R to download gzipped data file, extract, and import data

问题

A follow up to this question: How can I download and uncompress a gzipped file using R? For example (from the UCI Machine Learning Repository), I have a file of insurance data. How can I download it using R?

Here is the data url: http://archive.ics.uci.edu/ml/databases/tic/tic.tar.gz.

回答1:

I like Ramnath's approach, but I would use temp files like so:

tmpdir <- tempdir()

url <- 'http://archive.ics.uci.edu/ml/databases/tic/tic.tar.gz'
file <- basename(url)
download.file(url, file)

untar(file, compressed = 'gzip', exdir = tmpdir )
list.files(tmpdir)

The list.files() should produce something like this:

[1] "TicDataDescr.txt" "dictionary.txt"   "ticdata2000.txt"  "ticeval2000.txt"  "tictgts2000.txt"

which you could parse if you needed to automate this process for a lot of files.

回答2:

Here is a quick way to do it.

# create download directory and set it
.exdir = '~/Desktop/tmp'
dir.create(.exdir)
.file = file.path(.exdir, 'tic.tar.gz')

# download file
url = 'http://archive.ics.uci.edu/ml/databases/tic/tic.tar.gz'
download.file(url, .file)

# untar it
untar(.file, compressed = 'gzip', exdir = path.expand(.exdir))

回答3:

Please the content of help(download.file) for that. If the file in question is merely a gzipped but otherwise readable file, you can feed the complete URL to read.table() et al too.

来源：https://stackoverflow.com/questions/7044808/using-r-to-download-gzipped-data-file-extract-and-import-data

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