mat2cell operation coordinates cell

i have a program from my question in 14 feb 2013, answered by Azzi Abdelmalek.

A=rand(4,4,4,4)

[ii1,ii2,ii3,ii4]=size(A)

count=0

id=zeros(ii3*ii4,4);

for k=1:ii3

for p=1:ii4

   count=count+1;

   v=A(:,:,k,p);

   [val,idx]=min(v(:));

   [id1,id2]=ind2sub(size(v),idx);

   minval(count)=val;

   idx1(count)=id1;

   idx2(count)=id2;

   idx3(count)=k;

   idx4(count)=p;

   id(count,:)=[id1 id2 k p]  % correspondant indices

end

end

id is matrix that contains the information of coordinates that have the minimum value. my question, how to make there will be no same blocks that have minimum value ? because there's 2 different blocks have same blocks that have minimum value. how to prevent this condition ? i mean for, i dont want the 2 of same of id1, id2 have minimum value of one k,p. one id1,id2 just for k,p.