Having problem in for loop, Can you guys please help me?

I have variable name ROI_Mask_1, ......, ROI_Mask_9

and while using for loop like this,

for roi= 1:9

    Ref_L2(dates).SREF(bands).Sur_Ref_L2_MASK(roi,1) = mean(Sur_Ref_L2(mask_real_data & ROI_Mask_,(num2str(roi))));

end

I am getting error;

Unrecognized function or variable 'ROI_Mask'.

Answer 1

[David Hill]

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

[Rahul Shah]

my ROI_Mask_1 ....9 each ROI_Mask contains 7081x7801 size of logical matrix.

[David Hill]

Then the top code section above should work for you, just convert all your ROI_Mask's into a single 3D matrix.

[Rahul Shah]

Thank you David, its working now.