[Wien] Conjugate Gradient

[John Appleton]

Dear Prof. Blaha and Prof. L. Marks, 
  Why can't an accurate code like WIEN perform 
  conjugate gradient relaxtion by computing 
  the full hessian. Is the computation of the 
  second derivative of the energy very 
  expensive? Relaxation with WIEN is 
  far difficult than I thought. PORT keeps 
  failing. It is not easy to find a 
  set of deltas and etas for NEWT. 
  Is there a thumb rule for selecting 
  delta and eta (for NEWT/NEW1) 
  for systems with entirely 
  different masses? e.g. H and Pt.
   
  Thank you. 
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