[BioC] p-value output from MTP (multtest) into scientific notations

Boel Brynedal Boel.Brynedal at ki.se
Thu Dec 13 11:25:54 CET 2007

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,

> sessionInfo()
R version 2.6.0 (2007-10-03)

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

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