SyntaxError: Unexpected "for" in my matlab code

Good morning, I have an error message in my matlab code but I can't find where, it looks simple and all the variables are in their place I don't understand. Can you help me?

 [m,i] =  max(Natoms(4,:));
 [m,j] =  max(Natoms(4,:));
 [m,k] =  max(Natoms(4,:));
 Natoms(4,:) = Natoms(4,:).*0;
 Natoms(5,:) = Natoms(5,:).*0;
 Natoms(6,:) = Natoms(6,:).*0;
 d = [sqrt(D(1)*t) sqrt(D(2)*t) sqrt(D(3)*t);
 m = [level(i) level(j) level(k)];
 for kk = [1:Ni]
      levelnb = [1];
      if ion(kk,1) > 0
         type = ion(kk,5);
         xx = m(type) + erfinv(2*rand-1)*2*d(type);
         ion(kk,1) = ion(kk,1) + xx;
         x = ion(kk,1);
         [levelnb] = new_level(x,levelnb,1,level,L,dx);
         if levelnb(1) < L+1
             Natoms(3+type,levelnb(1)) = Natoms(3+type,levelnb(1)) + 1;
         end
      end
 end

 File "diffusionf.m", line 52
    for kk = [1:Ni]
       ^
SyntaxError: Unexpected "for"

Answer 1

[Steven Lord]

On the line where you define the variable d you have an opening square bracket but no corresponding closing square bracket.

[Tim Nemo]

Thank you very much !! :D