mode(-1);

data=[ [5 3 1];
[7 6 2];
[8 4 3];
];
matrixlength=3;

figure();

a=gca();
a.auto_scale="off";
a.data_bounds = [0 0; 10 10]; // Set the limits on x and y

for i=1:matrixlength
  
  x=data(i,1)
  y=data(i,2)
  class=data(i,3)
  plot2d(x , y)
  
  e=gce();              // Get a handle on the last Compound object
  point=e.children(1);  // Get a handle on the polyline
  point.mark_mode="on"; // Turn on mark mode (i.e. each point is represented by a small symbol)
  point.mark_style=class;   // Each marker is an integer (see help polyline_properties for a list)
  point.mark_foreground=class;
end