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seinecle edited this page Apr 17, 2013 · 9 revisions

Eonydis

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Eonydis reads a csv file and turns it into a moving network that you can visualize with Gephi

What do you mean by "moving networks"?

You can see a beautiful example here

More precisely, please...

Imagine you have an excel spreadsheet, with each line filled by a transaction between two agents:
Borrower,Lender,Sum borrowed,Date of the Loan
Marco, Dino, 5000$, 23 05 2011
Vincent, Luigi, 1500$, 12 10 2010
etc....
etc...

=> eonydis transforms this file into a new file, that Gephi can read. In Gephi, you will see the network made by Marco, Dino, Vincent and Luigi and the connections between them (the loans they echange) evolve through time, just like in the video above.

Is it complicated to use?

No. Eonydis is a click and point software. A test file is included in the zip to provide a first example.

For what kind of data is it for?

Every kind: Financial transactions as the example above, but also Twitter networks (ex: who mentions whom, when), mobile communication networks (who calls whom, when), biological networks, etc.

Do I need a special csv file?

No, the silly example above would be fine for example. But a few things need to be present in your csv (not much!):

  • the first line should have the title of your columns (just like the example above)
  • one of the fields should contain a date (since we want to create a dynamic network!)
  • that's it!

How do I use it?

  • download it on my website.
  • unzip the file, launch eonydis.exe
  • follow the instructions on the screens, step-by-step. You will be done in a minute.

I'm a network specialist: give me all the details!

  • the csv file is transformed into a gexf file , which is an xml format for rich network representations.
  • Eonydis does many things:
    static and dynamic node attributes
    dynamic edge attributes
    generates a directed, weighted network (attribute for weight is selected by the user)
    accepts strings and floats
    average or sum of the attribute values appearing at the same date.

Is it fast?

  • Very.

Bugs.

Eonydis is basically bug free, but it can fail in 2 cases frequently reported by users.

  • check that the years in your file are represented in 4 digits (1984), not 2 (84). Viewing your file with Excel, you might think that it is 4 digits indeed. BUT you should open your text file with a text editor and double check: it might be that the years are actually stored in 2 digits...
  • don't include double quotes (") in the values of your field, or other characters from this list.

Finally, where do I ask questions?

Drop me an email (see contact page on my website) or say hi on Twitter! (@seinecle)