minimize lbfgs <minimize-lbfgs-statement> end

<minimize-lbfgs-statement> :==

  maxfevaluations=<integer>
  --{Maximum number of energy evaluations during line search. Default=10}
  nstep=<integer>
  --{Number of minimization steps to perform. Default=10}
  tolgradient=<real>
  --{Tolerence for early termination of minimization. If the norm 
     of the gradient of the total energy falls below this value 
     minimization will stop. Default=0.0001}
  nprint=<integer>
  --{Frequency of printing energy values. Default=1}

  --{The limited-memory BFGS method of Liu and Nocedal is used. This
     uses a quasi-Newton minimization method. For further details see:
     D. C. Liu and J. Nocedal, On the limited memory BFGS method for
     large-scale optimization, Math. Programming 45, (1989) 503-528.}