help Adaptive median filter !!

a=imread('hh1.tif');
figure(1),imshow(a),title('origanal image');
b=imnoise(a,'salt & pepper',.02);
figure(2),imshow(b),title('noisy image');
Smax=9;
for i=1:254
  for j=1:254
      n=b(i:i+2,j:j+2)
      Zmin=min(n(:));
      Zmax=max(n(:));
      Zmed=median(n(:));
      sx=3;
      sy=3;
              A1=Zmed-Zmin;
              A2=Zmed-Zmax;
            if (A1>0) && (A2<0)
                B1 = Zxy-Zmin;
                B2 = Zxy-Zmax;
                if (B1>0) && (B2<0)
                      b(i:i+2,j:j+2) = n(i, j);
                    break;
                else
                     b(i:i+2,j:j+2) = Zmed;
                    break;
                end 
            else 
                sx=sx+2;
                sy=sy+2;
                if (sx > Smax) && (sy > Smax)
                    b(i:i+2,j:j+2) = n(i, j);
                end 
                end 
    end 
    end 
figure(3),imshow(b),title('denoised image');
i have problem withe for and if 
i have error

Answer 1

[DGM]

This answer discusses and provides a link to an implementation of a similar adaptive median filter:

https://www.mathworks.com/matlabcentral/answers/22368-adaptive-median-filter#answer_1143972