Setting up emacs org-mode babel for R on Ubuntu

I installed org-mode seperately, since I had troubles with its default setting (similar to the problems described here).

sudo apt-get install org-mode

Next I download and installed ESS

cd ~/.emacs.d/

Finally I had to add the following lines to my .emacs file:

(add-to-list 'load-path "~/.emacs.d/ess-12.09-1/lisp")
(require 'ess-site)
'((R . t)))

and to my .Rprofile

old options(defaultPackages = c(old, "tikzDevice"))

For testing open a new file with emacs:


and add the following code block:

#+begin_src R

press C-c C-c to execute the code. See the org-mode documentation for more information.

Posted in Computer, R, Ubuntu | 1 Comment

Vim-R-plugin: Installation

On Ubuntu 12.04, I took to the following steps to install Vim-R-plugin:

  1. First I had to install timux: sudo apt-get installl tmux
  2. Having already installed vim-pathogen, I used git to clone to install vim-r-plugin and vim-screen plugin, which is also required: cd ~/.vim/bundle
    git clone git://
    git clone git://
  3. Then I changed my localleader to “,”, by adding: let maplocalleader = ",", to my .vimrc file.
  4. Finally I added the following lines to my .Rprofile:


That it, everything works perfectly.

Posted in BASH, R, vim | 8 Comments

Reproducible research with markdown, knitr and pandoc

Over the last few weeks I was trying to optimise my workflow using markdow in combination with knitr and pandoc. Knitr is a grea new package by Yihui, expanding R’s capabilities for reproducible research.

I will illustrate my work flow with the following example, where I have a small R-script (script.r) that I want to embed into a report. However, I do not want to write LaTeX, nor I want/can specify my final output format in the beginning. That is where were pandoc comes in. Pandoc is the swiss-army knife if come to convert between markup languages.

The file script.r:

## @knitr gen-dat
a <- matrix(rnorm(100), nrow=10)

## @knitr plot

The report is written with  pandoc flavored markdown. The file ( contains

% A sample report
% The author
% `r date()`

<!-- Setting up R -->
`ro warning=FALSE, dev="png", fig.cap="", cache=FALSE or`

<!-- read external r code -->
```{r reading, echo=FALSE}

# The first part of my R script
Here I can generate my data

# Results
An now the reults are plotted
```{r plot-fig, result="asis"}

# More
Of course I can use inline elemtnts: 3 + 3 = `r 3+3`.

For each chunk there are plenty of options to modify it (see options).

To render my report, I need to first knit it in R and then use pandoc to convert it to the final format. This can be done with

Rscript -e "library(knitr); knit('')"

This results in a pandoc flavored markdown document. Now I can use pandoc to convert this document into all by pandoc supported output format (list of formats):

  • A pdf file: pandoc -s -t latex -o report.pdf
  • A html file: pandoc -s -o report.html (with the -c flag html files can be added easily)
  • Openoffice: pandoc -o report.odt
  • Word docx: pandoc -o report.docx

Files are available on github.

Posted in Computer, R, Uncategorized | Tagged , , | 11 Comments

lubridate: working with date and time in R

Working with date and time in R is sometimes tricky. Today I gave lubridate a try and was surprised on how easy it can be. Lubridate is a available on git and on CRAN. There is also a good introduction published in the Journal of Statistical Software.

# Create an object
bday <- dmy("23121984")

This could also have been achieved with any combination of d(ay)m(onth)y(ear), i.e. ymd() or dym().

Several options are provided to work with the bday object:

wday(bday)  # day of the week
wday(bday, label=T)  # day of the week, abreviated
yday(bday)  # day of the year

lubridate also makes it easy to calculate with dates

wday(bday + years(1), label=T)  # day of week one year later

table(sapply(1:100, function(x) wday(bday + years(x), label=T)))  # days of the week for next 100 years.
Posted in R, Uncategorized | Leave a comment

Add areas to a vector in GRASS

I sometimes use to convert a raster map in GRASS to a vector map. One way to find the area of each of the new polygons is:

# I am working with the vector map forests
v.add.col map=forests column="area double precision" map=forests option=area units=h columns=area

This will add the column area to forests and updates it with the size of the polygon in hectars.

Posted in Computer, GRASS | Leave a comment

Check ports

To check which ports are open on a server

nmap <ip of the server>

To check on the other hand which ports a server is listening to (before the firewall) run on the server

netstat -tulpn

where -t (tcp) -u (udp) -l (show listening sockets only) -p (show process id) -n (show numerical addresses)

Posted in Uncategorized | Leave a comment

Kill all processes of a user

To list all processes of myuser:

# list all processes of a user

ps -fu myuser

# grep pid

ps -fu myuser | awk 'NR !=1 {print $2}'

# kill them all

kill -9 $(ps -fu myuser | awk 'NR != 1 {print $2}')

Posted in BASH, Ubuntu | Leave a comment