[Ipopt] New Ipopt release 3.9.1

[John Hedengren]

Andreas,

There is a new IPOPT executable (v.3.9.1) for AMPL users on Windows.  It is
using the MUMPS linear solver.

http://apmonitor.com/wiki/index.php/Main/DownloadIpopt

This ipopt.exe was created with MSYS and GCC compilers.

Do you know of anyone who is willing to share standard benchmark test
results when there are new releases?  I have my own small (150) set of
academic and industrial problems but I'm looking for someone who may already
run some of the larger publicly available sets like CUTr.

-John





On Sat, Nov 27, 2010 at 3:52 PM, Andreas Waechter <andreasw at watson.ibm.com>
wrote:

Dear Ipopt users,

I created a new Ipopt release (3.9.1).  The changes include the following:

- Switch to the new COIN BuildTools system.  The location of the libraries
  and header files in the install directories has slightly changed, and
  we now support pkg-config for the COIN projects.  This new setup has
  been tested for a while, but in case you run into problems, please email
  the mailing list.

- Improved quasi-Newton approximation for the restoration phase.  The
  previous versions were not working well in case the Hessian matrix was
  approximated and the algorithm switched to the restoration phase.  In
  case you are using Ipopt with Hessian approximation, these recent
  changes might improve the performance in your setting.

- Interface to the R Project for Statistical Computing.  Jelmer Ypma
  contributed interface code for the R language (see
  Ipopt/contrib/RInterface).  Thanks, Jelmer!

- Intermediate callback functionality now available from C and Fortran
  interfaces.  The C and Fortran examples show you how to use it.

Regards,

Andreas

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