If you can advoid it, you should never make multiple variables but should place them all in a matrix. If ROI_Mask's are matrices you should just make a 3D matrix that you can index into.
ROI_Mask(:,:,1)=ROI_Mask_1;
ROI_Mask(:,:,2)=ROI_Mask_2;%repeat for all 9 (or change your code to produce them like this)
%then it is very easy to index into them
for k=1:9
Ref_L2(dates).SREF(bands).Sur_Ref_L2_MASK(k,1) = ...
mean(Sur_Ref_L2(mask_real_data & ROI_Mask(:,:,k)));
end
If ROI_Mask's are vectors, then a 2D matrix will work
ROI_Mask(1,:)=ROI_Mask_1;
ROI_Mask(2,:)=ROI_Mask_2;
for k=1:9
Ref_L2(dates).SREF(bands).Sur_Ref_L2_MASK(k,1) = ...
mean(Sur_Ref_L2(mask_real_data & ROI_Mask(k,:)));
end
