[BioC] backgroundCorrect for RGlist

[Harpreet Kaur Saini]

Hi,

I am analyzing the two-color array data and for the background correction,
I am using the backgroundCorrect function.

RGb<-backgroundCorrect(RG,method="normexp",offset=50).

where RG is the RGlist.

I am getting the following error:

Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function "backgroundCorrect", for
signature "RGList"

Here is my sessionInfo()
R version 2.8.0 (2008-10-20)
i386-apple-darwin8.11.1

locale:
C

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

other attached packages:
 [1] statmod_1.3.8             MASS_7.2-45
 [3] Ringo_1.6.0               SparseM_0.78
 [5] arrayQualityMetrics_1.8.1 marray_1.20.0
 [7] beadarray_1.10.0          sma_0.5.15
 [9] hwriter_0.93              latticeExtra_0.5-4
[11] simpleaffy_2.18.0         affyPLM_1.18.0
[13] preprocessCore_1.4.0      gcrma_2.14.1
[15] matchprobes_1.14.1        RColorBrewer_1.0-2
[17] vsn_3.8.0                 affy_1.20.0
[19] genefilter_1.22.0         survival_2.34-1
[21] geneplotter_1.20.0        annotate_1.20.1
[23] xtable_1.5-4              AnnotationDbi_1.4.2
[25] lattice_0.17-17           Biobase_2.2.1
[27] limma_2.16.3

loaded via a namespace (and not attached):
[1] DBI_0.2-4          KernSmooth_2.22-22 RSQLite_0.7-1      affyio_1.10.1
-- 

Any help would be great.

Thanks.

Harpreet Kaur Saini
Enright Group
EMBL - European Bioinformatics Institute
Wellcome Trust Genome Campus
Hinxton
Cambridge
CB10 1SD
Tel: +44-(0)-1223-492676