[BioC] what is meaning of NA in M values

Heidi Dvinge heidi at ebi.ac.uk
Thu Jan 21 20:43:16 CET 2010

Hello Neeraj (?)

you're not really giving us much information to work with here. How have
your processed the arrays? If you use a background correction resulting in
negative values from some probes, then these will become NA for the M
values since that's log2(R/G).


> hi,
> i normalized two color agilent array and when i extract the normalized M
> values ,in the file there NA is written instead of values for some
> genes.What does that meaning.
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