[BioC] Subsetting marrayRaw

[michael watson (IAH-C)]

Hi

I am currently using the marray* Bioconductor packages to analyse my data.
My data, in GenePix format, has been read successfully into marrayRaw classes.

I now want to be able to subset my data - for example, I may want to calcualte the co-efficient of variance, or some other statistic there isn't an in-built method for, for each print tip; or each grid row; or each grid column.  My planned method for doing this was to use the subset() function in some way, but I can't figure out how to access grid location details for each spot through the marrayRaw class - although I know it must be possible as lots of other functions, for example in marrayPlots, can slice marrayRaw objects up and draw things like print-top Loess lines.

Thanks in advance for your help

Mick