I am having problems reading in some publicly available chromosome X
titration Nsp chip CEL files. The data are available from the Affymetrix
website:

http://www.affymetrix.com/support/technical/sample_data/copy_number_data.affx

I have not modified the data in anyway. Here is what happens when I try to
read the data:

> library(affxparser)
> path <- "./rawData/3X/Mapping250K_Nsp/"
> pathnames <- list.files(path=path, pattern="[.](cel|CEL)$",
full.names=TRUE)
> pathnames
[1] "./rawData/3X/Mapping250K_Nsp//NA04626_NSP_R1.CEL"
[2] "./rawData/3X/Mapping250K_Nsp//NA04626_NSP_R2.CEL"
[3] "./rawData/3X/Mapping250K_Nsp//NA04626_NSP_R3.CEL"
[4] "./rawData/3X/Mapping250K_Nsp//NA04626_NSP_R4.CEL"
> hdr <- readCelHeader(pathnames[1])
terminate called after throwing an instance of
'affymetrix_calvin_exceptions::UnableToOpenFileException'

Process R aborted at Tue May 13 15:01:55 2008

As you see R aborts. The same failure happens when I try to load in any of
the other CEL files. My R session info is:

> sessionInfo()
R version 2.7.0 Under development (unstable) (2008-01-21 r44087)
x86_64-unknown-linux-gnu

locale:
LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C

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

Thanks for any help.

Matt

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