Your specification is not clear and this is a guess.
x = 2*rand(10, 1);
y = 2*rand(10, 1);
scatter(x, y)
hold on
dx = 0.1; dy = 0.1;
for i=1:length(x)
plot(x(i)+dx*[-1 1 1 -1 -1], y(i)+dy*[-1 -1 1 1 -1], 'r-');
end
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