[BioC] Problem with negative gene locations

[Naira Naouar]

Dear all,

I am using the Arabidopsis affymetrix microarray and I would like to 
collect the probeset positions on the genome.
I used ath1121501.db and strangely, I got negative positions....
Is this normal??

 >library(ath1121501.db)
 >kchrl=mappedkeys(ath1121501CHRLOC)
 > get(kchrl[2],ath1121501CHRLOC)
     1
-11649
 > sessionInfo()
R version 2.8.0 (2008-10-20)
x86_64-unknown-linux-gnu

locale:
LC_CTYPE=en_US;LC_NUMERIC=C;LC_TIME=en_US;LC_COLLATE=en_US;LC_MONETARY=C;LC_MESSAGES=en_US;LC_PAPER=en_US;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US;LC_IDENTIFICATION=C

attached base packages:
[1] tools     stats     graphics  grDevices utils     datasets  methods
[8] base

other attached packages:
[1] ath1121501.db_2.2.7 RSQLite_0.5-6       DBI_0.2-3
[4] AnnotationDbi_1.4.3 Biobase_2.2.2





-- 
==================================================================
Naïra Naouar 

Tel:+32 (0)9 331 38 63
VIB Department of Plant Systems Biology, Ghent University
Technologiepark 927, 9052 Gent, BELGIUM
nanao at psb.vib-ugent.be                         http://www.psb.vib-ugent.be