please help me to remove the error .... when i execute my code following error is occurd "Matrix dimensions must agree. Error in ==> ACO_FOR_EDGE at 90 if ant_pos_idx & ant_search_range_temp == ant_memory;"

im1=double(imread('D:\l.jpg')); im=rgb2gray(im1); [m n]=size(im);

% total no. of ants % ant_total_num = round(sqrt(m*n)); ant=zeros(1,ant_total_num); % ant's position ant_pos_idx = zeros(ant_total_num, 2);

search_mode = '8';

pixel_visibility=zeros(m,n);

 % pheromoe_matrix=zeros(m,n);%
 pheromoe_matrix= zeros(m,n);
for i=1:m
   for j=1:n
         pheromoe_matrix(i,j) = 0.01;
   end 
end

% initialisation of parameters % alpha = 1; beta = 10; T=.08; pheromone_evap_rate = 0.05; im_max=255; % B=.45; %k=20;

 A =25;
 memory_length = round(rand(1).*(1.15*A-0.85*A)+0.85*A); % memory length 
 ant_memory = zeros(ant_total_num, memory_length);

%rand('state', sum(clock)); temp = rand(ant_total_num, 2); ant_pos_idx(:,1) = round(1 + (m-1) * temp(:,1)); %row index ant_pos_idx(:,2) = round(1 + (n-1) * temp(:,2)); %column index

     for ant_idx = 1:ant_total_num

                ant_current_row_idx = ant_pos_idx(ant_idx,1);
                ant_current_col_idx = ant_pos_idx(ant_idx,2);

                    rr = ant_current_row_idx;
                    cc = ant_current_col_idx;

                      if   search_mode == '8'
                    rr = ant_current_row_idx;
                    cc = ant_current_col_idx;
                    ant_search_range_temp = [rr-1 cc-1; rr-1 cc; rr-1 cc+1; rr cc-1; rr cc+1; rr+1 cc-1; rr+1 cc; rr+1 cc+1];
                      end

for i=2:m-1
   for j=2:n-1
       im2 = [im(i - 1, j - 1) -  im(i + 1, j + 1) , im(i - 1, j + 1)-im(i + 1, j - 1) , im(i, j - 1) - im(i, j + 1), im(i-1,j)-im(i+1,j)];
     pixel_visibility(i,j) = (1/im_max) * max(im2);
   end
end

 for i=1:m;
    for j=1:n;
        num(i,j)=((pheromoe_matrix(i,j)) * (pixel_visibility(i,j)^10));
    end
 end

 for u=1:ant_search_range_temp;
    for v=1:ant_search_range_temp ;
    deno(u,v)=0;
       mul(u,v)= ((pheromoe_matrix(u,v)) * (pixel_visibility(u,v)^10));
       deno(u,v)=deno(u,v)+mul(u,v);
    end
 end

for k=1:ant_total_num; for i=1:m; for j=1:n; if ant_pos_idx & ant_search_range_temp == ant_memory; prob(i,j)=o else prob(i,j)=num(i,j)/deno(u,v); end

       end
end
end 
     end