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KNITRO 6.0 Release Notes
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New features added in KNITRO 6.0
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1) KNITRO 6.0 introduces new features for solving optimization models
   (both linear and nonlinear) with binary or integer variables.
   The KNITRO mixed integer programming (MIP) code offers two
   algorithms for mixed-integer nonlinear programming (MINLP).  The
   first is a nonlinear branch and bound method and the second
   implements the hybrid Quesada-Grossman method for convex MINLP.
   The KNITRO MINLP code is designed for convex mixed integer
   programming and is a heuristic for nonconvex problems.  The MIP code
   also handles mixed integer linear programs (MILP) of moderate size.
   A MIP problem is defined and solved using the new API functions
   "KTR_mip_init_problem()" and "KTR_mip_solve()".  In addition many
   new user options beginning with "mip_*" have been added to offer
   user control over the MIP methods.  See more details in the KNITRO
   User's Manual and in the MINLP examples provided in the C and Java
   examples directory.  

2) The KNITRO multi-start generation of new start points is improved.
   The user option "ms_maxbndrange" for generating initial points, now
   only applies to unbounded variables, while the new user option
   "ms_startptrange" establishes a maximum initial range for all
   variables. The default value of "ms_savetol" was also increased.

3) KNITRO 6.0 offers improved performance of the SLQP active-set
   algorithm on simple bound-constrained optimization models.  This
   will often be the most efficient algorithm for these types of
   problems. 

4) General performance improvements have been made for both the
   active-set and interior-point/barrier solvers.

Bug Fixes in KNITRO 6.0
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- Fixed a bug that caused thread-safety issues when using the
  active-set algorithm in KNITRO 5.2 on Windows.

- Fixed bug where bad (i.e. scaled) values for the multipliers
  corresponding to simple bounds were returned to the user.

- Fixed bug in printing bad (i.e. scaled) objective function for
  MPECS. 

- Fixed bug that could cause "honorbnds" to be accidentally turned off
  when "bar_penaltycons=2".

See the KNITRO60_UserManual for more information on the new features.
The full history of KNITRO releases is available at
  http://www.ziena.com/release_hist.htm.