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Plotting in Matlab by groups or (labels)

How to plot in Matlab by labels?
Suppose You have some data:
1st case – we have 1-d (dimension) data or vector, so the next step is to plot this vector:
>plot(data,'b*');

Now You’ve made some classification using f.e. kmeans algorithm:
>[IDX,C]=kmeans(data,5,'emptyaction','singleton');
So we have labels in vector IDX and centroids in C. Now let’s try to plot data-vector using labels
>scatter(1:1000, data, 30, IDX, 'filled');

Let’s scale Y to log in order to see small values

The same thing we can make with 2-dimension data