How to change the averaging for a plot?

Hi,

I have imaging data that to calculate the signal intensity we do 4 averaging for each RF pulse frequency.Now I want to change my average to 2,although it calculates 4 averaging but I need to use the last 2 for my plot.I really appreciate any help.here is part of the code.The plot is figure 180.

for roiroi = 1:roiNumber

figure(11);

hold on;

[x, y, BW1, xi, yi] = roipoly;

plot(xi,yi);

for iii=1:slicenumber1

vv = finaldata_moh(:,:,iii) .* BW1;

vvv1 = vv(vv>0);

mmh(iii) = mean(vvv1);

end

mmh1 = mmh;

mmh1 = mmh1 -min(mmh1(:));

mmh1 = 100*mmh1 ./max(mmh1(:));

mmh5 = mmh1;

imagesNo_sort = sort(imagesNo);

mmh5_sort = sort(mmh5);

figure(180);

plot(imagesNo_sort,mmh5,'s');

xlabel('imagesNo_sort');

ylabel('Signal intensity (%)');

xlim([0 20])

grid on

hold on;

end