[R] Using lib Rstreams and gzfile()

Prof Brian Ripley ripley at stats.ox.ac.uk
Tue Dec 11 12:02:01 CET 2001


Rstreams has been withdrawn (as has been presaged for several months).
You don't need it any longer.


On Tue, 11 Dec 2001, Sven Garbade wrote:

> Hi all,
>
> in the last time I've intensively used Rstreams to read and write from
> binary files. Now I'm wondering if it is possible to use Rsteams
> functions with gzipped files. But I haven't found the trick:
>
> > p1c.gzip <- gzfile("daten/p1c_all.mea.gz", open="rb")
> > readBin(p1c.gzip, integer(), n=64,size=2)
>  [1]    84     1   400     1   749     0     0     0     0     0
> 0     0
> [13]     0     0     0     0     0     0     0     0     0     0
> 0     0
> [25]     0     0     0     0     0     0     0     0 11884 25888 25977
> 11552
> [37] 22560     0     0     0     0     0     0     0     0     0
> 0     0
> [49]     0     0     0     0     0     0     0     0     0     0
> 0     0
> [61]     0     0     0     0
>
> this is ok, but then with readint from Rstreams:
>
> > seek(p1c.gzip, 0, "start")
> [1] 128
> > readint(p1c.gzip, 64,2)
>  [1] -25620 -17287  21838 -16137  -8489   3835  13806 -28067 -30452
> -24244
> [11]  11464  18547   5320 -24287 -13180 -14761  13486  -2902  18582
> 8798
> [21]  29513  21369 -27830  10578  29509 -13015 -23255 -13784  25643
> 11960
> [31]  -4233  -8515  -2123  -6311  -4455  28531  -1163  -2077   -775
> -25282
> [41]  -6161  -2242 -12679  -2128  27610 -16977  24278 -25369     61
> 11268
> [51]    532 -27778 -21424 -17619 -29359 -19503 -10426  22632  28771
> -20751
> [61] -23825 -25437 -24301  -4469
> >
>
> Is it impossilble to use Rsteams function with the connection functions
> from the base package or have I missed something? System R 1.3.1 on
> Debian Linux.
>
> Thanks, Sven
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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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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