x = 1:2:100;
y = (0.5 .* x - 0.56) + randn(size(x)) .* 5.;

f = figure();
set(f, 'paperunits', 'centimeter', 'papersize', [15, 5], ...
    'paperposition', [0, 0, 15, 5], 'color', 'white');

subplot(1, 3, 1);
scatter(x, y, 15, 'r', 'filled');
xlabel('x');
ylabel('y');
text(-35, max(ylim) * 1.075,'A', 'FontSize', 12);

subplot(1, 3, 2)
scatter(x, y, 1:length(x), 'r');
xlabel('x');
ylabel('y');
text(-35, max(ylim) * 1.075,'B', 'FontSize', 12);

subplot(1, 3, 3)
colors = zeros(length(x),3);
colors(:,1) = round(1:255/length(x):255)/255';
scatter(x, y, 15, colors, 'filled')
xlabel('x');
ylabel('y');
text(-35, max(ylim) * 1.075,'C', 'FontSize', 12);

saveas(f, '../lecture/images/scatterplot.png')