
          must contain the output feedback matrix F.
          If FBTYPE = 'I', then the feedback matrix is assumed to be
          an M x M order identity matrix.
          The array F is not referenced if FBTYPE = 'I'  or
          ALPHA = 0.

  LDF     INTEGER
          The leading dimension of array F.
          LDF &gt;= MAX(1,M) if FBTYPE = 'O' and ALPHA &lt;&gt; 0.
          LDF &gt;= 1 if FBTYPE = 'I' or ALPHA = 0.

  K       (input) DOUBLE PRECISION array, dimension (LDK,N)
          The leading M