n = 20;               % number of coin flips
P = 0.6;              % probability of head
u = rand(n, 1);       % n random numbers between 0 and 1
heads = u < P;        % true if head showed up
nheads = sum(heads);  % number of heads
fprintf('Of %d coin flips, %d heads showed up.\n', n, nheads);