To debug R code

Either :
* put the command browser() : will stop where the command "browser" was called
* or call the function debug : debug(name_function_to_debug) : will stop at the start of the script
* options(error=recover)

Type "Q" to exit the browser. Type "n" to execute the next line. Type "c" or ENTER to continue running and exit the function.

Installing RNetCDF (ncdf) in R

Taken from https://stat.ethz.ch/pipermail/r-help/2008-March/157089.html
This is ubuntu 10.4.

sudo apt-get install libudunits2-0 libudunits2-dev
sudo apt-get install libnetcdf4 libnetcdf-dev

Then in R :
install.packages("RNetCDF",configure.args="--with-netcdf-include=/usr/include")

Note : A regular install is unable to find netcdf.h, giving the error below. Use rather the install.packages command given above.

checking for netcdf.h... no
configure: error: netcdf header netcdf.h not found
ERROR: configuration failed for package ‘ncdf’