%% Create Scatter Chart with Transparency
% Create a scatter plot using blue, semitransparent markers. Then, add a second scatter plot using red, semitransparent markers. Specify the marker color by setting the MarkerFaceColor and MarkerEdgeColor properties of the scatter series object. Specify the transparency by setting the MarkerFaceAlpha and MarkerEdgeAlpha properties to a scalar value between 0 and 1.

x = [5 10 11 13 18];
y1 = [40 80 150 80 50];
a1 = 100*[100 50 80 30 50];
scatter(x,y1,a1,'MarkerFaceColor','b','MarkerEdgeColor','b',...
    'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2)
axis([0 20 0 200])

x = [2 6 8 11 13];
y2 = [30 40 100 60 140];
a2 = 100*[30 50 30 80 80];
hold on
scatter(x,y2,a2,'MarkerFaceColor','r','MarkerEdgeColor','r',...
    'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2)
hold off

% Copyright 2015 The MathWorks, Inc.