how to show points?
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Chris Barnhart on 19 Jan 2015
This is an answer. Not sure its what you wanted.
x = [10 10 70 70]; y = [30 90 30 90]; % make some random vectors 100x4 nrp = 100; r1=10* (rand(nrp, length(x)) - 0.5); r2=10* (rand(nrp, length(x)) - 0.5);
% extend x and y into 100x4 then add the random variable rx = repmat(x, nrp, 1) + r1; ry = repmat(y, nrp, 1) + r2;
plot(x, y, 'o', rx, ry,'.');
Here the random points fill a square block around the points. If you want a circular region, generate a random r and a random angle, then convert to x and y. If you want a density to drop off, thats a bit more difficult.