[R] alpha parameter in function rgb to specify color

Michael Toews mwtoews at sfu.ca
Thu Mar 8 06:28:29 CET 2007

Part of the problem is that alpha is a new and undocumented feature 
(note to developers: add this info into the pdf and rgb documentation). 
It only works in PDFs (maybe on quartz on Macs?), so you need to write 
to a PDF file:


Now open up the PDF file...

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