zip.file.extract

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Hello everyone,

Can anyone give me some hint/suggestion for unzipping a file in R?  The
help file for "zip.file.extract" function seems to be difficult to
understand.  

For example, the name of my zip file is "refGene.txt.gz", which is
located in "C:\Documents and Settings\Desktop\test1".  I would like to
unzip this file to the same directory.
That seems fairly unlikely to be a zip file; it looks like a gzip file, 
based on the extension.

zip.file.extract is for zip archives.  The closest equivalent in the 
gzip world is a .tar.gz file.

I don't know if there is a built-in gunzip function, but you can call a 
system function using system().

Duncan Murdoch

Here's the syntax from the help file, 

zip.file.extract(file, zipname = "R.zip", unzip = getOption("unzip"))

What I should use for the "file" and the "zipname" arguments?  I tried
different ways, but none of them is working.  Thank you!

Best regards,

Arthur

Arthur Xuejun Li

City of Hope Comprehensive Cancer Center

Department of Information Science

1500 East Duarte Road

Duarte, CA 91010 - 3000

Ph:   (626) 256-4673 ext. 65121

Fax: (626) 471-7106

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On 3/19/2009 2:30 PM, Li, Xuejun wrote:
Hello everyone,

Can anyone give me some hint/suggestion for unzipping a file in R?  The
help file for "zip.file.extract" function seems to be difficult to
understand. 

For example, the name of my zip file is "refGene.txt.gz", which is
located in "C:\Documents and Settings\Desktop\test1".  I would like to
unzip this file to the same directory.
That seems fairly unlikely to be a zip file; it looks like a gzip
file, based on the extension.

zip.file.extract is for zip archives.  The closest equivalent in the
gzip world is a .tar.gz file.

I don't know if there is a built-in gunzip function, but you can call
a system function using system().

see gzip in R.utils.  admitedly, it's help page is quite informative, as
opposed to that for zip.file.extract.

vQ