[BioC] Questions for Affy package on hist() and boxplot()

[Luo, Wen]

When using Affy package to QC the data with hist(), how to label the
array id on the histogram to differentiate the multiple arrays on the
same graph.
 
Our array id usually has a long name.  When using the boxplot(), how to
rotate the label to be vertical, so the full array id could be seen.
 
This might be basic R questions, but I couldn't find the answer easily.
 
Thanks.
 
Wen

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