Hi Carlos, try this code:
dataset = rand(20,2);
zoneXY = rand(1,2);
zoneRadius = rand(1);
dists = sqrt(sum(bsxfun(@minus, dataset, zoneXY).^2,2));
inZone = dists < zoneRadius;
figure
plot(dataset(:,1),dataset(:,2),'.'), hold on
rectangle('Position',[zoneXY-zoneRadius zoneRadius*2 zoneRadius*2],'Curvature',[1 1])
if any(inZone)
firstInZone = find(inZone,1,'first')
plot(dataset(firstInZone,1),dataset(firstInZone,2),'gs')
legend({'Data points','First Pt In Zone'})
end
Does it describe your problem and how to find an answer?
