[BioC] Why does a call to "unique" removes a DNAStringSet names?

[Nicolas Delhomme]

Hi,

I've just realized that a call to unique on a DNAStringSet would result in the names slot to disappear. There's nothing about this in the documentation, but if that's the desired effect, warning about it would be good :-)

Here is how to reproduce it:

library(Biostrings)
dset<-DNAStringSet(c("A","C"))
names(dset) <- c("a","a")
dset
unique(dset)


It gives:

> dset
  A DNAStringSet instance of length 2
    width seq                                               names               
[1]     1 A                                                 a
[2]     1 C                                                 a
> unique(dset)
  A DNAStringSet instance of length 2
    width seq
[1]     1 A
[2]     1 C

My sessionInfo():

R version 2.15.1 (2012-06-22)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

locale:
[1] C/UTF-8/C/C/C/C

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

other attached packages:
[1] Biostrings_2.25.8  IRanges_1.15.24    BiocGenerics_0.3.0

loaded via a namespace (and not attached):
[1] stats4_2.15.1 tools_2.15.1 

Cheers,

Nico

---------------------------------------------------------------
Nicolas Delhomme

Nathaniel Street Lab
Department of Plant Physiology
Umeå Plant Science Center

Tel: +46 90 786 7989
Email: nicolas.delhomme at plantphys.umu.se
SLU - Umeå universitet
Umeå S-901 87 Sweden