er of the
          matrix A; also the number of rows of matrix B and the
          number of columns of the matrix C.  N &gt;= 0.

  M       (input) INTEGER
          The dimension of input vector, i.e. the number of columns
          of matrices B and D.  M &gt;= 0.

  P       (input) INTEGER
          The dimension of output vector, i.e. the number of rows of
          matrices C and D.  P &gt;= 0.

  NR      (input) INTEGER
          The order of the reduced order system.  N &gt;= NR &gt;= 0.

  A      