The java source code for the figures in the paper:

Roberts PD (2007) Stability of complex spike timing-dependent
plasticity in cerebellar learning. J Comput Neurosci 22:283-96

is available here:

From the paper:

"Dynamics of spike-timing dependent synaptic plasticity are analyzed
for excitatory and inhibitory synapses onto cerebellar Purkinje
cells. The purpose of this study is to place theoretical constraints
on candidate synaptic learning rules that determine the changes in
synaptic efficacy due to pairing complex spikes with presynaptic
spikes in parallel fibers and inhibitory interneurons. ..."

Note that the link in the paper (shown in the name of the link)
is redirected here to the updated link (don't copy the name of this
link because it is not useful, but you can click on it).