Blog Archives

Logistic map: Feigenbaum diagram

March 17, 2012
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Logistic map: Feigenbaum diagram

The other day I found some old basic code I had written about 15 years ago on a Mac Classic II to plot the Feigenbaum diagram for the logistic map. I remember, it took the little computer the whole night to produce the chart.With today's computers even...

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Change in life expectancy animated with geo charts

March 12, 2012
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Change in life expectancy animated with geo charts

The data of the World Bank is absolutely amazing. I had said this before, but their updated iPhone App gives me a reason to return to this topic. Version 3 of the DataFinder App allows you to visualise the data on your phone, including motion maps, see...

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German train monitor provides access to train delay data

March 10, 2012
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German train monitor provides access to train delay data

The German newspaper Süddeutsche Zeitung (SZ) worked together with OpenDataCity to create an online train monitor of the German network: Zugmonitor. This is another great example of the new form of data journalism.The project provides access to data o...

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googleVis 0.2.15 is released: Improved geo and bubble charts

March 4, 2012
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googleVis 0.2.15 is released: Improved geo and bubble charts

The guys behind the Google Visualisation API don't seem to rest. On 22 February 2012 they released an update of their API. Google added options for a gradient colour axis to bubble chart and a magnifying glass to geo chart, which opens when the user ho...

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Kölner R User Meeting 30 March 2012

March 1, 2012
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Kölner R User Meeting 30 March 2012

Am 30. März 2012 möchte ich gerne das erste Kölner R Benutzer Treffen organisieren. Ich habe an den Treffen in London in den vergangen Jahren teilgenommen und hoffe auch in Köln Gleichgesinnte zu finden, die sich gerne bei einem Kölsch über R and...

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Show me the data! Or how to digitize plots

February 27, 2012
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Show me the data! Or how to digitize plots

I had mentioned the Guardian's data blog and the need for more data journalism earlier here. What I really like about the Guardian's approach in particular is that they share the data of their articles and encourage readers to use it.Of course there ar...

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Big data seminar in London on 1 March 2012

February 20, 2012
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Big data seminar in London on 1 March 2012

Removable disk packs in 1975Source: Wikipedia, via Deutsche Fotothek  David Chan from City University is organising an interdisciplinary symposium on tackling the ‘Big Data’ challenge on 1 March 2012.It is an open seminar trying to bring ...

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Reshaping the IT world

February 16, 2012
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Reshaping the IT world

During my university time I worked on the IT help desk for a while. One day I received a call from a professor, who said that his printer had stopped working. So I asked him, if there was a message on the display and if he could read it to me. "Oh yes"...

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The reshape function

February 9, 2012
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The reshape function

The other day I wrote about the R functions by, apply and friends, which allow me to operate on subsets of data. All those functions work nicely, if the data is given in the right format. More often than not it isn't and I have to reshape the data befo...

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googleVis 0.2.14 is released

February 5, 2012
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googleVis 0.2.14 is released

Version 0.2.14 of the googleVis package was released on CRAN today.ChangesThe help files have been checked against changes of the Google Visualisation API, typos in the vignette have been ironed out (thanks to Pat Burns for pointing them out), a new se...

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