Monthly Archives: March 2013

Error installing R package e1071

I wanted to play around with the Floyd-Warshall algorithm today. Lucky for me, it’s included as part of the e1071 package. When I tried to install it – from the CRAN repository and from source – I got

ERROR: 'configure' exists but is not executable

The solution (from a recent post on Jonathan Callahan’s blog) is to “set the TMPDIR environment variable which R will use as the compilation directory.” For me, this meant

$ mkdir ~/tmp
$ export TMPDIR=~/tmp

[C]ertain genotypes are evolutionarily inaccessible under rapid environmental change. Rapidly deteriorating environments not only limit mutational opportunities by lowering population size, but they can also eliminate sets of mutations as evolutionary options.

From Lindsay et al. 2013

Pulling the rug out from under the trees

I’ve written about a rabbit over on The Modern Forest.