Delete rows and cols of a sparse matrix

I ve got a nx3 matrix, which correspont to a nxn sparse matrix with a x,y and the weight z. I want in a for loop to find and delete specific x, y. For example I want iterative to delete from 1 to n the first column and row the second row and column until the nth row and column in order to create n-1 matrices with (n-1 rows and columns). How can I look inside the sparse representatino of the matrix in order to do such a thing?

Answer 1

[Matt J]

 S=sparse(x,y,z);
 C=cell(1,n-1);

 tmp=S;

 for i=1:n

   tmp(1,:)=[]; 
   tmp(:,1)=[];

   C{i}=tmp;

 end

[Matt J]

Or, to have the results in the original three-column form

   for i=1:n

    tmp(1,:)=[]; 
    tmp(:,1)=[];

    [i,j,s]=find(tmp);
    C{i}=[i,j,s];

   end