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Like many, I have been in awe of the d3.js and cubism.js visualization packages created by Mike Bostock.
Mike Bostock @ Square talks about Time Series Visualization from Librato on Vimeo.
The charts are beautiful and extraordinarily functional, so I thought it would be fun to at least replicate the horizon chart (unfortunately without the helpful overlays and real-time updating). I was so happy with the result that I thought I would wrap it up in a function as a gift to my loyal readers.
And here in the mirrored form.
R code from GIST: