Hello all, I've just been trying to add detection calls to an "ExpressionSetIllumina" created with "beadarray". I couldn't find this mentioned in the vignettes, but found the function "calculateDetection" lying around. Would this be the recommended way of using it? (near-working example, except that since the data contains no control-probes the actual detection values are left as NaN) library(beadarray) data(BSData) BSData <- setAnnotation(BSData,"Humanv1") Detection(BSData) <- calculateDetection(BSData) rownames(Detection(BSData)) <- featureNames(BSData) colnames(Detection(BSData)) <- sampleNames(BSData) Many thanks! Cei > sessionInfo() R version 2.8.0 (2008-10-20) i386-apple-darwin8.11.1 locale: en_GB.UTF-8/en_GB.UTF-8/C/C/en_GB.UTF-8/en_GB.UTF-8 attached base packages: [1] stats graphics grDevices datasets tools utils methods [8] base other attached packages: [1] beadarray_1.10.0 sma_0.5.15 hwriter_0.93 [4] geneplotter_1.20.0 annotate_1.20.1 xtable_1.5-4 [7] AnnotationDbi_1.4.1 lattice_0.17-15 limma_2.16.3 [10] Biobase_2.2.1 loaded via a namespace (and not attached): [1] DBI_0.2-4 KernSmooth_2.22-22 RColorBrewer_1.0-2 RSQLite_0.7-1 [5] grid_2.8.0 -- The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a company registered in England with number 2742969, whose registered office is 215 Euston Road, London, NW1 2BE.