[BioC] EdgeR : CPM with names of genes

[anna [guest]]

Hello dear List,
when I save a cpm table (ordered by p-value for example) , I do not have the names of the genes but only cpms. How can I add them ?
I used :
> o <- order(lrt$table$PValue)
> tab <- cpm(y)
> write.table(tab, file="CPM.txt")
thank you,
anna

 -- output of sessionInfo(): 

R version 2.15.1 (2012-06-22)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=French_France.1252  LC_CTYPE=French_France.1252   
[3] LC_MONETARY=French_France.1252 LC_NUMERIC=C                  
[5] LC_TIME=French_France.1252    

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

other attached packages:
[1] edgeR_3.0.0  limma_3.14.1

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