[R] untar() error

[Prof Brian Ripley]

On 03/05/2013 08:31, Hakim Abdi wrote:
> Dear List,
>
> I have a list of 600+ *.gz files that I would like to extract and read the
> geotiffs contained within them. I tried using the untar() function to
> simplify this task but I am stumped by an error. I've combed the Internet
> for a solution without luck. The details are below, and any help in solving
> this matter is appreciated.

Those are most likely not tar files.  What does file (the command-line 
program contained in Rtools) say they are?

>
>> files = list.files(path = "J:/GIMMS/NDVI", pattern = "data.tif.gz",
> all.files = TRUE, full.names = TRUE, recursive = TRUE, ignore.case = TRUE,
> include.dirs = TRUE)
>
>> lapply(files, untar)
> Error in rawToChar(block[seq_len(ns)]) :
>    embedded nul in string: 'II*\0Ì <\001´
> \0\0`G\0\0\fn\0\0¸”\0\0d»\0\0\020â\0\0¼\b\001\0h/\001\0\024V\001\0À|\001\0l£\001\0\030Ê\001\0Äð\001\0p\027\002\0\034>\002\0Èd\002\0t‹\002\0
> ²\002\0ÌØ\002\0xÿ\002\0$&\003\0ÐL\003\0|s\003'
>
>> untar(files[1])
> Error in rawToChar(block[seq_len(ns)]) :
>    embedded nul in string: 'II*\0Ì <\001´
> \0\0`G\0\0\fn\0\0¸”\0\0d»\0\0\020â\0\0¼\b\001\0h/\001\0\024V\001\0À|\001\0l£\001\0\030Ê\001\0Äð\001\0p\027\002\0\034>\002\0Èd\002\0t‹\002\0
> ²\002\0ÌØ\002\0xÿ\002\0$&\003\0ÐL\003\0|s\003'
>
>> untar("J:/GIMMS/NDVI/1981/81aug15a.n07-VIg/81aug15a.n07-VIg_data.tif.gz")
> Error in rawToChar(block[seq_len(ns)]) :
>    embedded nul in string: 'II*\0Ì <\001´
> \0\0`G\0\0\fn\0\0¸”\0\0d»\0\0\020â\0\0¼\b\001\0h/\001\0\024V\001\0À|\001\0l£\001\0\030Ê\001\0Äð\001\0p\027\002\0\034>\002\0Èd\002\0t‹\002\0
> ²\002\0ÌØ\002\0xÿ\002\0$&\003\0ÐL\003\0|s\003'
>
>> traceback()
> 3: rawToChar(block[seq_len(ns)])
> 2: untar2(tarfile, files, list, exdir)
> 1: untar(files[1])
>
>> sessionInfo()
> R version 2.15.2 (2012-10-26)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
>
> locale:
> [1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
> States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C
>
> [5] LC_TIME=English_United States.1252
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
>
>
> _______________________________________
>
> Hakim Abdi
> Doctoral Student
>
> Physical Geography and Ecosystem Science
> Lund University
> Sölvegatan 12, 223 62 Lund, Sweden
>
> Office: +46 (0) 46 2223132
> Mobile: +46 (0) 73 9300116
>
> Email: hakim.abdi at nateko.lu.se
>
> 	[[alternative HTML version deleted]]
>
>
>
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>


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595