Kohonen and CPANN Toolbox
The Kohonen and CPANN toolbox is a collection of MATLAB modules for developing Kohonen Maps and Counterpropagation Artificial Neural networs (CPANNs). These are well known neural networks aimed to cluster analysis and the study of data structure (Kohonen Maps) and to the data classification (CPANNs). A graphical user interface (GUI), which allows an easy model calculation and analysis of results, is also provided with the toolbox.
 
 Help files
HTML files are provided toghter with the MATLAB files, in order to help the user. The HTML help provides some underlying information on Kohonen Maps and CPANNs (see Theory section); it also explains how to prepare your data, how to handle the Neural Network settings and how to calculate the models. An example of analysis (on the classical IRIS data set) is shown. Finally, some bibliographic references to Kohonen Maps and CPANNs are given.
 
 Conditions and warranty
The toolbox is freeware and may be used (but not modified) if proper reference is given to the authors. Preferably refer to:

Ballabio D, Consonni V, Todeschini R. (2009) The Kohonen and CP-ANN toolbox: a collection of MATLAB modules for Self Organizing Maps and Counterpropagation Artificial Neural Networks. Chemometrics and Intelligent Laboratory Systems, 98, 115-122

In short, no guarantees, whatsoever, are given for the quality of this toolbox or for the consequences of its use. It is inevitable that there will be some bugs, but we have tried to test the algorithms thoroughly.
 
 Source

You can freely download the MATLAB modules:

download Kohonen and CPANN Toolbox