title: Deconvolution Between Matrix and Sub Matrix
body: <p>I have a matrix <code>a=[[1 2 3]; [4 5 6]; [7 8 9]]</code> and a submatrix <code>b=[[5 6];[8 9]]</code>.</p>
  
  <p>Is there a method in matlab for deconvolving <code>(a,b)</code> ?</p>
  
  <p>I am looking for a method fo recognize the presence of a submatrix in a possible giant matrix. By a sort of deconvolution I expect to obtain something like a matrix with zeros all around and <code>1</code> in the place where the submatrix is present.</p>
  
  <p>In the above example, a <code>1</code> in the right-down corner.</p>