Running ApE on Ubuntu 14.4

ApE is a free plasmid editor, convenient to plan a cloning experiment. The Linux version is not maintained anymore, but still runs on Ubuntu 14.4 (Mac and Windows versions are both maintained).
To run on Ubuntu, download the latest Linux version, unzip and run, using:

cd ApE Linux
tclsh8.5 AppMain.tcl

If this does not work, you may have to install tk8.5 and tcl8.5:

sudo apt-get install tk8.5 tcl8.5

Add summary label in stacked bar chart using ggplot

The script below illustrates how to add one label per stack in a stacked bar chart using ggplot in R. In this case, labels indicate the sum of values represented in each bar stack. The idea is to create as many labels as bars, but assign text to only one label per stack, then plot labels according to stack height.