Hi Crispin,

1/
I installed xmap database in my localhost.
but when I ask for transcript for a probeset. it always returns NULL or NA.

> xmapDatabase("Human")
done.
> probeset.to.transcript("3102379")
[1] NA
> probeset.to.transcript("1112997")
NULL
> probeset.to.transcript("3933543")
[1] NA
> probeset.to.transcript("3102411")
[1] NA
> probeset.to.transcript("3102443")
[1] NA
> probeset.to.transcript("2315101")
NULL

for the function of probe.to.transcript, which tables in
xmap_homo_sapiens_core_47_36i have been used?

2/ 
in mysql database, I found probeset_id=1427856 has 7120 probes.
does this probeset has really so many probes?
in R I can not find probes for this probeset as below:

> probeset.to.probe("1427856")
NULL

is there anything wrong in my installation or using?

thanks
Yuan



----- Original Message ----
From: Crispin Miller <CMiller@picr.man.ac.uk>
To: Jay an <jayuan2007@yahoo.com>
Cc: Bioconductor <bioconductor@stat.math.ethz.ch>
Sent: Tuesday, January 22, 2008 1:19:49 AM
Subject: Re: [BioC] exonmap RMA function


Hi,
If you have a copy of the X:Map database installed and exonmap set up
properly, then a call to probeset.to.transcript(X), where X is a list
 of
probeset ids, will give you a transcript list back...

See ?probeset.to.transcript and the vignette for more details...

cheers
Crispin





On 21/1/08 11:41, "Jay an" <jayuan2007@yahoo.com> wrote:

> Martin, Thanks.
> the corresponding between probeset and probe can be obtained by using
> mget(featurenames(x.rma), exon.pmcdf). my another question is:
> is there a way to get corresponding between transcripts
> and probesets?
> 
> thanks
> Yuan
> 
>
 
--------------------------------------------------------


This email is confidential and intended solely for the\ ...{{dropped:22}}

