Articles by Michal

Installing ‘intergraph’ package

September 17, 2010 | Michal

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 ... [Read more...]

Namespaces and name conflicts

August 31, 2010 | Michal

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 ... [Read more...]

From igraph to network and back again

August 25, 2010 | Michal

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 ... [Read more...]

Social contagion? Maybe not…

July 28, 2010 | Michal

Recently there was a lot of racket about results presented in papers by a pair Nicholas Christakis & James Fowler. Their papers gained a lot of attention both in the academic world as well as in media. In their papers they claim to provide evidence for social contagion (transmission through social ... [Read more...]

What Social Network Analysis software do you use?

May 12, 2010 | Michal

See a the poll here by Gabriel Rossman at Code and Culture. I voted for R and ‘igraph’. If you use R you are getting access to all the other wonderful things that come with R. Using specialized package, like Pajek, UCINET etc requires constant going back and forth between ... [Read more...]

R’s working directory

October 3, 2008 | Michal

Do you usually start R with a desktop icon or some other shortcut? Are you tired of using setwd and getwd each time after you start R to get the working directory correctly? If so, then your days of suffering might be just coming to an end. Having the working ... [Read more...]

rgraph6 on R-Forge

September 4, 2008 | Michal

I have moved my rgraph6 R package to R-Forge. R-Forge is a website that facilitates development of R packages by providing services for version control (through Subversion), automatic checking and building of the packages including binaries for Windows and MacOS, as well as for collaboration with other R users/developers. ... [Read more...]

UseR!2008 aftermath

August 30, 2008 | Michal

Earlier in August I was on the R user conference which this year took place in Dortmund. It was a quite an exciting event gathering around 500 people from around the globe and featuring 170 presentations and talks. Topics varied from new developments in the R system, newly implemented statistical methods as ... [Read more...]

maps of Poland in R

June 23, 2008 | Michal

Bogdan Taranta (website in Polish) is developing a set of functions for drawing administrative maps of Poland. I wrote similar functionality for myself already some time ago, but only for voivodships, i.e. top-level administrative units, and also in a rather low resolution. Bogdan’s contribution seems to contain all ... [Read more...]

S3 vs S4, efficiency issues

May 23, 2008 | Michal

While developing some new simulation code with S4 system I stumbled upon some big difficulties in terms of computational efficiency. That lead me to diging into archives of Rhelp and Rdevel looking for clues. I found some interesting threads that address almost exactly the same problems that I do. Read ... [Read more...]

Writing Rd files in Vim

March 3, 2008 | Michal

I have made a small “translation” of a portion of “Writing R Extensions” manual about the Rd files to a vimhelp format. You can find it on, under this link If that does not work just search for a ... [Read more...]

ERGMs in R

January 23, 2008 | Michal

Developers of statnet, a collection of packages for R for fitting Exponential Random Graph Models (ERGM), issued a major update. First change is that the main package is now called ergm. Secondly, a set of additional packages has been made available. Apart from package network, that provides a class system ... [Read more...]

Resources for S4 classes and methods

January 23, 2008 | Michal

Learning the programming in the new S4 system of classes and methods in R can be quite cumbersome, even though the methods package is very well documented. That is why I collected some of the info and materials that I am aware of on a separate page here. I warmly ... [Read more...]

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