[BioC] Oligo package and tiling arrays - PM and MM

[Naira Naouar]

Dear all,

I am using the oligo package to analyse affymetrix tiling array data and 
I don't understand why PM and MM do not have the same length...
Here is the code:

 > #### READ CEL FILES
 
 > TOTAL_DATA = read.celfiles(exp_file,pk="tilingcdf")
Incompatible phenoData object. Created a new one.
Platform design info loaded.

 > x=pmindex(TOTAL_DATA)
 > length(x)
[1] 3092374
 > y=mmindex(TOTAL_DATA)
 > length(y)
[1] 3092338

 > sessionInfo()
R version 2.5.0 (2007-04-23)
x86_64-unknown-linux-gnu

locale:
LC_CTYPE=en_US;LC_NUMERIC=C;LC_TIME=en_US;LC_COLLATE=en_US;LC_MONETARY=en_US;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] "splines"   "tools"     "stats"     "graphics"  "grDevices" "utils"   
[7] "datasets"  "methods"   "base"    

other attached packages:
            tilingcdf                 oligo BufferedMatrixMethods
              "1.0.0"             "1.0.2-6"               "1.0.0"
       BufferedMatrix               RSQLite                   DBI
              "1.0.1"               "0.5-6"               "0.2-3"
               affyio               Biobase
              "1.4.1"              "1.14.0"

Thanks,
Naira

-- 
==================================================================
Naira Naouar 

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