storing data into a vector within nested for loop

im = imread(im);

im = im2bw(im);

truths = sum(sum(im));

s = size(im);

xtot = s(2);

ytot = s(1);

for xcount = 1:xtot,

    for ycount = 1:ytot,

        if im(ycount,xcount) == 1

            sqrt((xcount-coord(2)).^2+(ycount-coord(1)).^2)

        end

    end
end
end