I suspect there is a setlocale(LC_ALL,'C') somewhere in the main of R,
but not in the shared library which rpy loads.
Laurent
2008/11/13 Barry Rowlingson <[EMAIL PROTECTED]>:
> 2008/11/13 Aurelie Bornot <[EMAIL PROTECTED]>:
>> Ok
>> So I tried the same chart in python/rpy and in R.
>>
>> Here are the lines I type in python/rpy :
>> m = pylab.load("test.data")
>> m
>> array([[ 1., 2.],
>> [ 2., 3.],
>> [ 3., 4.],
>> [ 4., 5.],
>> [ 5., 6.],
>> [ 6., 7.],
>> [ 7., 8.],
>> [ 8., 9.],
>> [ 9., 10.]])
>> r.postscript("TEST_Rpy.ps")
>> r.plot(m[:,0],m[:,1])
>> r.dev_off()
>> {'null device': 1}
>>
>> And here are the lines I type in R:
>> m=read.table("test.data")
>> m
>> V1 V2
>> 1 1 2
>> 2 2 3
>> 3 3 4
>> 4 4 5
>> 5 5 6
>> 6 6 7
>> 7 7 8
>> 8 8 9
>> 9 9 10
>> postscript("TEST_R.ps")
>> plot(m[,1],m[,2])
>> dev.off()
>> null device
>> 1
>>
>> I join the file test.data and the 2 postscript outputs.
>> The 2 postscripts are of the same size but I can't open TEST_Rpy.ps.
>> TEST_R.ps is ok for me : I can open it without problem.
>>
>> Can you see another difference between the two?
>
> Yes! Commas!
>
> Running 'diff' on them gives lots of these:
>
> < 59.76 502.43 (10) .5 0 90 t
> ---
>> 59,76 107,25 (2) .5 0 90 t
>
> I didn't notice it at first, but numbers are comma separated in the
> python version. This must be a locale-specific way of showing decimal
> numbers that's only set in Python...
>
> PostScript is expecting those numbers to have decimal points (they
> are coordinates on the page), and not commas, and hence it gets
> confused. I reckon in theory you could make R do this without
> involving Python, so it could be an R bug. I wouldn't report it as an
> R bug until you can do that though.
>
> Weird!
>
> Barry
>
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