[BioC] Getting the list of NA values from an MAList in limma

Sean Davis sdavis2 at mail.nih.gov
Fri Aug 13 11:57:19 CEST 2004


I'm not sure what format you want your data to be in to accomplish your 
stated task, but you might need so see ?is.na and ?apply.


On Aug 13, 2004, at 5:11 AM, michael watson (IAH-C) wrote:

> Sorry, this is due to my lack of knowledge of R I suspect!
> I have an MAList object in limma containing several arrays.  I access
> the column of M values thus:
> MAn[,3]$M
> Where Man is my MAList object.  What I want to do is create a factor
> which tells me which entries of that M column are NA and which aren't -
> I basically want to highlight on a background plot those spots which 
> are
> going to produce a negative value after background subtraction, and
> therefore an NA value in the MAList object.
> Thanks in advance for the help
> Mick
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