%add_ex1
X = [1 2 5 -2 -1];
Y = [9 6 -3 5 7];
numpoints = 5;
refx = 0; refy = 0;
%loop over all x,y points to find the one closest to (0,0)
mindist = 999;
maxdist = -9999;
avgdist = 0;
for i=1:numpoints
    xd = X(i)-refx;
	yd = Y(i)-refy;
	dist = sqrt(xd*xd + yd*yd);
    avgdist = avgdist+dist;
    if (dist < mindist)
        mindist = dist;
    end
    if (dist > maxdist)
        maxdist = dist;
    end
end
mindist
maxdist
avgdist = avgdist/numpoints;
avgdist