Ex. 3 - MDS and Kernel PCA
One way of making the nice colourful plots like in Fig. 11.2 in the lecture
handout:

MATLAB:
Matlab provides the function 'scatter' to add the values for the colouring
of the nodes automatically. Check the help on how to use it.

R:
We couldn't find an equivalent function to 'scatter', so we programmend
something like that ourselves. The code is in the file plot_colour.R on the
homepage. If you use this function, try to understand what it does.

There are for sure other ways for plotting these things, so feel free to
do it differently!