[BioC] Subsetting marrayRaw

[Jean Yee Hwa Yang]

Hi Michael,

If data is a marrayRaw object, use
maPrintTip(data) to obtain print-tip information
For other Grid location details, use:
maGridRow(data), maGridCol(data), maSpotRow(data), maSpotCol(data).

You should be able to subset a marrayRaw object the same way you subset
matrix.
E.g.
data[maPrintTip(data) == 1,]
will produce a marrayRaw object consists of data from print-tip 1.

Hope this helps.

Jean


On Wed, 30 Jul 2003, michael watson (IAH-C) wrote:

> 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
> 
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