f LIWORK.

  LIWORK  INTEGER
          The length of the array IWORK.  LIWORK  &gt;= 2*K+N.

  DWORK   DOUBLE PRECISION array, dimension (LDWORK)
          On exit, if INFO = 0, DWORK(1) returns the optimal LDWORK,
          and DWORK(2), ..., DWORK(1+K) contain the Frobenius norms
          of the factors of the formal matrix product used by the
          algorithm.
          On exit, if INFO = -24, DWORK(1) returns the minimum value
          of LDWORK.

  LDWORK  INTEGER
          The length of the array