matrices A, E, Q, and X, and the number of rows of the
          matrices B and L.  N &gt;= 0.

  M       (input) INTEGER
          The number of system inputs. If JOBB = 'B', M is the
          order of the matrix R, and the number of columns of the
          matrix B.  M &gt;= 0.
          M is not used if JOBB = 'G'.

  P       (input) INTEGER
          The number of system outputs. If FACT = 'C' or 'D' or 'B',
          P is the number of rows of the matrices C and/or D.
          P &gt;= 0.
          O