(This article was first published on Computing / Geek, and kindly contributed to R-bloggers)
A while ago I had the need to produce some posters that included lots of data (scientific style). Having recently got back into R and learning LaTex I googled for a way to do this using R. Here's what I found and ended up with, using R, LaTex, Beamer and BeamerPoster.
You can pull my beamerposter template and an example Sweave Rnw file from my Github.

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