To build applications, the OGP and NETLAB packages need to be made accessible to Matlab. This is achieved either dumping the codes from both packages into the same directory as the application (unadvised!), or creating separate directories for the two packages and adding the directories to Matlab's search path, using the addpath() command.

A convenient way of organising the workspace in your computer is to create the file startup.m and put it into the directory containing your code. If the file contains the following lines:

addpath('path_to_your_local_OGP_copy')
addpath('path_to_your_local_NETLAB_copy')

then the Matlab codes should be running without error.

Some issues which should mainly concern users who do not have a new Matlab version:

• The function address type '@fn' is used, this is not accepted by older Matlab versions.
• The 'Matern' type of kernel uses the 'psi'-function which was made available within Matlab starting from version 6.5, users with older versions of Matlab will not be able to use this class of kernels (unless they write the 'psi'-function', available in eg. The Numerical Recipes).