Dear BioC people,
 
I have a little technical question about how the order of the probesets
in an exprSet is defined.
Is this order given by the order of the probesets in the corresponding
cdf environment (e.g. ls(mouse4302cdf))?
Or is it alphabetical?
Or is it "unconstrained"?
 
In the examples I've looked at both the order of the probesets in the
cdf environment and the exprSets are the same (and alphabetical). 
 
But is it a characteristic which is desired by development or is it just
fortuitous?
 
Thank you in advance for your insight...
Adrien Jamain
 

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