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Am I reading it right? R generated that?

The visualization definitely wasn't done in R. I'm guessing he used Gephi (see, for example, http://gephi.org/2010/map-geocoded-data-with-gephi/).

How can you tell that it definitely was not done in R? He says

> As a sanity check, I plotted points at some of the latitude and longitude coordinates. To my relief, what I saw was roughly an outline of the world.

His plot doesn't "know" about the world - he is just drawing curves between points in a plane (lat. and long.). I haven't used R, but I am sure that would be possible.

Because I use R quite often, and R just doesn't produce graphs that look like that :).

But yes, it's probably possible to draw an uglier version of the visualization. (I know you can draw the individual points on the plane, so drawing lines between points is probably available as well, though I'm not so sure about the great circles part.)

Ok. I believe you :) It just seemed simple enough that anything that could do graphics would be able to do it.

I bet you Gephi cannot handle more than tens of thousands of node.

You're surprised? Why?

I can't speak for the poster you're responding to, but if it's easy to make things that pretty in R, I suddenly want to learn it.

My experience with R is that it generates much more... utilitarian output.

We're all wondering what he used to visualize his data set.

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