you can use the 'hold on' command to preserve the figure and add information to it, see below for an example
% create an empty figure
figure
% enable to plot multiple data
hold on
% start a loop...
for i = 1:5
% create a new dummy matrix
MyMatrix = rand(20,3) * 10;
% plot the points
scatter3(MyMatrix(:,1),MyMatrix(:,2),MyMatrix(:,3),'filled')
end
% stop the data gathering in the figure
hold off
% create a legend
legend("Iteration"+(1:5))
view(3)
axis equal
grid on
