title: how to compute all the minors with a given order of a matrix in matlab
body: <p>I have a matrix m*n,
  I want from it all the minors (the determinant of the submatrices) of order p.</p>
  
  <p>I din't found anything good in the documentation, I could do it with a function written by my self, but I'd prefer something out of the box.</p>
  
  <p>My real need is to check when,in a symbolic matrix, I have a fall of rank,and that happens when all the minors of that rank and above are zeros.</p>
  
  <p>Any idea to do it with pure matlab comands? since there is a function to evalutate rank it has get the minors someway.</p>