[R-sig-Geo] Re: About dealing 2-byte code characters(ex.Japanese) in new maptools

[Roger Bivand]

On Mon, 1 Nov 2004, Susumu Tanimura wrote:

> Dear Ono-san and Professor Bivand,
> 
> In my environment, Japanese characters in your example works fine with
> read.dbf() in maptools ver. 0.4-8.

Thank you for this contribution - it is not easy to debug
platform-dependent issues like this. I think having a corpus of files
would also help - as you mention below, the coding standard may differ as
does the platform. Having a small collection of DBF files known not to
behave the same across platforms should help, I hope - I can host them, or
maybe one of those of you close to the 2-byte character problem could host
them?

> 
> My environment: VineLinux3.0, R-2.0.0_ja-1vl1, maptools ver. 0.4-8
> 

which also means foreign_0.8-0, because maptools_0.4-8 depends on it. Note 
that the problem was on Windows XP, I think with the standard binary R 
from CRAN.

> I am afraid that it is due to EUC-JP encoded DBF file and R localized
> into Japanese, though. 
> 
This is possible, but all input is helpful here, also because R will 
migrate towards multi-character support at some stage. 

> Availing myself of this question, let me ask a way to confirm if
> read.dbf() has been surely replaced by maptools.  I have just done
> "update.packages()" for obtaining the latest foreign and maptools.

The internal function dbf.read(), accessed as maptools:::dbf.read() in 
maptools up to 0.4-6, and as dbf.read() in maptools 0.4-7 is not present 
at all in maptools 0.4-8. If you just type the names of the functions at 
the prompt, the final line shows which namespace they live in:

> library(maptools)
Loading required package: foreign 
> read.dbf
function (file, as.is = FALSE) 
{
....
    df
}
<environment: namespace:foreign>

shows that read.dbf() from foreign is being used.

Roger Bivand

> 
> --
> Susumu Tanimura
> Dept. of Socio-environmental Medicine
> Inst. of Tropical Medicine, Nagasaki University
> 
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> 

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: Roger.Bivand at nhh.no