Author Archives: Kornelius Rohmeyer
Using JavaGD in Java applications
Goal: Create a Java application with a JFrame that contains a JGDPanel from JavaGD and plot something via JRI. Solution: The following code is a derivate of JGR code snipplets under GPL-2: import java.awt.Component; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import javax.swing.JFrame; … Continue reading
Linux USB driver for the Arexx TL-500 – Part II
Last time we started communicating with the TL-500. This time we want to find out the meaning of the data rows from the IN endpoint. Therefore we start the USB Sniffer SnoopyPro again and observe the data flow under Windows … Continue reading
Using libusb to write a Linux USB driver for the Arexx TL-500 – Part I
The Arexx TL-500 is a well-priced temperature and humidity logging system. But with only twelve direct requests for a Linux USB drivers, Arexx recently decided to abandon their plans creating a Linux driver for this device (I think there is … Continue reading
Because it is autumn
GeSHi Error: GeSHi could not find the language r (using path /var/www/techblog/wp-content/plugins/codecolorer/lib/geshi/) (code 2) You need library colorspace.
Shortcuts in R under Unix from the readline library
Under Unix you can use in R the the advanced features for command editing and command history that the GNU Readline Library provides. Both Emacs and vi editing modes are available and the Emacs-like keybindings are installed by default. Here … Continue reading
OpenOffice advanced fill down
When people come to me for statistical advise, they often bring Excel files containing data like the following, where values are only written down when they change. But often it is required for further analysis that each row is completely … Continue reading
Detexify
A useful link today: Detexify2 – LaTeX symbol classifier And don’t forget to take a look at Detexify explained. I love this tool! It’s useful and also really fun to train.
Random Correlation Matrices
Some time ago one of my colleagues with a new method for evaluating the cumulative distribution function of a multivariate normal distribution wanted to compare the speed of his method with that of randomized quasi-Monte Carlo methods. While we were … Continue reading
Executable application launcher
Under Linux we are creating launchers for our applications according to the Freedesktop Desktop Entry Specification. With recent versions of Gnome or KDE we get the following launcher: When the launcher is clicked, it is asked whether the application should … Continue reading
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