Kohonen self-organizing maps demo, by Dave Touretzky.

-  Type "kohdemo" to run the demo.

- Set the variable KohDataSet to an integer between 1 and 7
  to try different training sets:

       KohDataSet = 1	Square distribution
       KohDataSet = 2	Circular distribution
       KohDataSet = 3	L-shape distribution
       KohDataSet = 4	Triangular distribution
       KohDataSet = 5	Square with cutout
       KohDataSet = 6	Two blobs
       KohDataSet = 7	Sine wave
