Dear List, I am using the MTP command in the multtest package and have a simple (?) question. In my output, all (adjusted) p-values smaller than ~0.000979 equals 0. Which means that I have a list of approximately 2000 transcripts with p-value = 0. Is it possible, in the MTP command, to format the p-values to scientific notations (10 to the power of..)? Thankful for any suggestions, Boel > sessionInfo() R version 2.6.0 (2007-10-03) x86_64-unknown-linux-gnu locale: ... attached base packages: [1] grid splines tools stats graphics grDevices utils [8] datasets methods base other attached packages: [1] hgu133plus2_1.16.0 annaffy_1.8.1 KEGG_1.16.1 [4] GO_1.16.0 simpleaffy_2.10.31 genefilter_1.14.1 [7] IDPmisc_0.9.5 lattice_0.16-5 affyPLM_1.12.0 [10] gcrma_2.10.0 matchprobes_1.10.0 affydata_1.11.3 [13] affy_1.16.0 preprocessCore_1.0.0 affyio_1.6.1 [16] multtest_1.18.0 survival_2.32 Biobase_1.16.1 loaded via a namespace (and not attached): [1] annotate_1.14.1 rcompgen_0.1-15 --~*~**~***~*~***~**~*~-- Boel Brynedal, MSc, PhD student Karolinska Institutet Department of Clinical neuroscience Karolinska University hospital Huddinge Division of Neurology, R54 141 86 Stockholm SWEDEN