Posts Tagged ‘ Networks ’

Grexit stage left: visualizing the online discussion around Greece’s possible Euro exit

May 24, 2012
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Grexit stage left: visualizing the online discussion around Greece’s possible Euro exit

  While Tsipras and his Syriza coalition have been busy in Greek parliament, the Internet has been a-buzz with speculation that their platform will result in a Greek exit from the Euro currency.  This prospect, affectionately dubbed “Grexit” by Citi… Read more ›

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New food web dataset

October 14, 2011
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New food web dataset

So, there is a new food web dataset out that was put in Ecological Archives here, and I thought I would play with it. The food web is from Otago Harbour, an intertidal mudflat ecosystem in New Zealand. The web contains 180 nodes, with 1,924 links. Fu...

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basic ggplot2 network graphs – ver2

March 23, 2011
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basic ggplot2 network graphs – ver2

I posted last week a simple function to plot networks using ggplot2 package. Here is version 2. I still need to work on figuring out efficient vertex placement.Changes in version 2:-You have one of three options: use an igraph object, a matrix, or a da...

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basic ggplot2 network graphs

March 17, 2011
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basic ggplot2 network graphs

I have been looking around on the web and have not found anything yet related to using ggplot2 for making graphs/networks. I put together a few functions to make very simple graphs. The bipartite function especially is not ideal, as of course we only w...

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Bipartite networks and R

January 14, 2011
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Bipartite networks and R

Earlier, I posted about generating networks from abundance distributions that you specify. If this post was interesting, check out Jeff Kilpatrick's website, where he provides code he produced in R and Octave to compare real bipartite networks to ones ...

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Ecological networks from abundance distributions

January 6, 2011
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Ecological networks from abundance distributions

Another grad student and I tried recently to make a contribution to our understanding of the relationship between ecological network structure (e.g., nestedness) and community structure (e.g., evenness)......Alas, I had no luck making new insights. How...

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Co-authorship Network of SSRN Conflict Studies eJournal

November 10, 2010
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As part of my on-going research simulating network structure using graph motifs I have been collecting novel data sets to test and benchmark the method. Since I am a political scientist studying conflict, it was suggested to me to collect a co-authorship network within this sub-discipline. Such a network is useful for several reasons;

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Installing ‘intergraph’ package

September 17, 2010
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Installing ‘intergraph’ package

After some e-mails I decided to put together a bit more detailed instruction how to install the ‘intergraph’ package together with the namespaced version of the ‘network’ package. See here. There seemed to be some problems with downloading the namespaced ‘network’ from my webstite (thanks Neil!). File permissions were set incorrectly. I fixed that and

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Namespaces and name conflicts

August 31, 2010
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Namespaces and name conflicts

R packages ‘igraph’ and ‘network’ are good examples of two R packages providing similar but complementary functionalities for which there are a lot of name conflicts. As for now the ‘igraph’ package has a namespace while the ‘network’ package (version 1.4-1) does not. This became an issue when I was working on the ‘intergraph‘ package.

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From igraph to network and back again

August 25, 2010
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From igraph to network and back again

In an effort to achieve this (last paragraph), I created a couple of functions to coerce networks as ‘igraph’ objects to networks as ‘network’ objects and vice versa. I wrapped them into a package called ‘intergraph’ which I just uploaded to my personal miniCRAN. Please mind, this is still an experimental version! Might be bug-infested.

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