   (input) INTEGER
          The number of system inputs.  M &gt;= 0.

  P       (input) INTEGER
          The number of system outputs.  P &gt;= 0.
          P &lt;= M if BETA = 0.

  NR      (input/output) INTEGER
          On entry with ORDSEL = 'F', NR is the desired order of the
          resulting reduced order system.  0 &lt;= NR &lt;= N.
          On exit, if INFO = 0, NR is the order of the resulting
          reduced order model. For a system with NU ALPHA-unstable
          eigenvalues and NS ALP