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I am currently writing an MSc thesis involving unsupervised learning/clustering. I am wishing to illustrate the basic concepts of clustering using a figure. The figure I wish to draw should look somewhat like this image from Wikipedia: https://en.wikipedia.org/wiki/Cluster_analysis#/media/File:KMeans-Gaussian-data.svg

How can I draw a similar figure in LaTeX?

Thanks in advance.

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    Welcome to TeX.SX! This should be possible with pgfplots. – user31729 Apr 19 '16 at 8:22
  • pgfplots can certainly do it. For a start, take a look at section 3.4.2 Scatter Plot Use–case B in the manual for pgfplots. (Open a command prompt/terminal and write texdoc pgfplots to open the manual.) – Torbjørn T. Apr 19 '16 at 8:35
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Metapost provides a normaldeviate command that will give you Gaussian random numbers that you can add to a given coordinate. Here's a way to use it to draw clusters.

enter image description here

prologues := 3;
outputtemplate := "%j%c.eps";

% draw n random points centered on Z with r scattering 
vardef draw_cluster(expr Z, n, r, marker) = 
   for i=1 upto n:
      draw marker shifted Z shifted (r*normaldeviate, r*normaldeviate);
   endfor
enddef;

beginfig(1);

u = 1cm;
z1 = (2u, 6.4u);
z2 = (u, 4.2u);

picture mark[];
mark1 = image(draw fullcircle scaled 3 withcolor .67 blue);
mark2 = image(draw fullcircle scaled 3 withcolor .67 red);

randomseed := 1701;

draw_cluster(z1, 32, 0.8u, mark1);
draw_cluster(z2, 24, 0.3u, mark2);

endfig;
end.

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