+ x_1*x_3*Q_2 + x_2*x_3*x_4*Q_3</pre><p>where multi-indices are</p><pre>           midx_1 = 0       (absolute term, Q_1)
           midx_2 = [1,3]   (bilinear term, Q_2)
           midx_3 = [2,3,4] (term for Q_3)</pre><p>List of elements of the user structure <tt>pmidata</tt></p><pre> name ... [optional] name of the problem
 Nx ..... number of primal variables
 Na ..... [optional] number of matrix inequalities (or diagonal blocks
          of the matrix constraint)
 xinit .. [optional] dim (Nx,1), starting 