How to write the MATLAB code for generating such figure?

[Walter Roberson]

scatter() and yline()

[Atsushi Ueno]

x = 1:100;
y = rand(size(x)) * 300 + 9200;
y2 = y;
for i = 2:size(x,2)
    y2(i) = min(y2(i-1),y(i));
end
scatter(x,y,'x');
xlabel('Run number');
ylabel('Total cost');
hold on
plot(x,y2);
hold off
legend('Solutions','Best solution');
ylim([9100 9700]);

[Assen Beshr]

thank you Atsushi ueno ,you answer was exact what I want. thanks again lot.