diffusion-based cartograms with R
Cart produces density-equalising maps or "cartograms" based on a diffusion-based method by Michael T. Gastner and Mark E. J. Newman.
Cart, the cartogram software by
Michael T. Gastner and Mark E. J. Newman, consists of a couple of C source code
files that are shipped with the R
package. Cart
depends on the FFTW C library, which can be
installed on Debian with
apt-get install libfftw3-dev
on Fedora with
yum install fftw3-devel
and on openSUSE with
zypper install fftw3-devel
First, install the R packages that cart depends on:
Rscript -e "install.packages(c('maps', 'maptools', 'rdyncall', 'sp'))"
After checking out a copy of the cart source code, build the R package tarball with:
R CMD build cart/
Then, install it with:
R CMD INSTALL cart_x.y.z.tar.gz
If you want to install the R package tarball and get an error message such as
Error in untar2(tarfile, files, list, exdir) : unsupported entry type ‘x’
this means the R internal function untar2 fails. In this case, set the
environment variable R_INSTALL_TAR to a system tar utility, e.g., on
GNU/Linux, do
export R_INSTALL_TAR="tar"
Starting with version 0.3.0 I try to follow the semantic versioning rules.