from ?seek
‘seek’ returns the current position (before any move), as a
(numeric) byte offset from the origin, if relevant, or ‘0’ if not.
Your string is nul terminated (9 bytes long). That would be the
current offset. If you only read one byte, you'd have to be more than
0 bytes offset.
Jeff
On Fri, Feb 4, 2011 at 4:35 AM, Christian Ruckert
<[email protected]> wrote:
> To me it seems like writeBin() writes one char/byte more than expected.
>
>> con <- file("testbin", "wb")
>> writeBin("ttccggaa", con)
>> close(con)
>
>> con <- file("testbin", "rb")
>> readBin(con, what="character")
> [1] "ttccggaa"
>> seek(con, what=NA)
> [1] 9
>> close(con)
>
>> con <- file("testbin", "rb")
>> readBin(con, what="raw", n=20)
> [1] 74 74 63 63 67 67 61 61 00
>> seek(con, what=NA)
> [1] 9
>> close(con)
>
> As the numbering starts with 0 the position should be 8 and not 9 after
> reading. There were two older threads which look very similar to my problem:
>
> http://tolstoy.newcastle.edu.au/R/e2/devel/06/11/1119.html
> http://r.789695.n4.nabble.com/Re-Problem-reading-binaries-created-with-fortran-More-infos-td974396.html
>
> Thanks in advance,
> Christian
>
>
>
>> sessionInfo()
> R version 2.12.0 (2010-10-15)
> Platform: x86_64-pc-linux-gnu (64-bit)
>
> locale:
> [1] C
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> other attached packages:
> [1] Biostrings_2.18.2 IRanges_1.8.8
>
> loaded via a namespace (and not attached):
> [1] Biobase_2.10.0
>
> ______________________________________________
> [email protected] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
--
Jeffrey Ryan
[email protected]
www.lemnica.com
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