20 May

SolverStudio 0.09.03 (20160520) released

We have released SolverStudio_00_09_03_00 20160520. This includes:

  • Fixes for NEOS to avoid connection aborted errors (caused by NEOS getting tougher, and us having been pinging their server too frequently).
  • Update of CMPL to v1.1, which gives substantial speed improvements. (Thanks, Mike, for this.) This improves support for Mike’s CMPL/SolverStudio textbook.
  • Update to GLPK/GMPL 4.6

SolverStudio_00_09_03_00 20160520.zip (11721 downloads) 23 MB

13 May

Analytics Textbook using SolverStudio

If you speak German, you may be interested in the recently published book:

Mike Steglich, Dieter Feige und Peter Klaus: Logistik-Entscheidungen: Modellbasierte Entscheidungsunterstützung in der Logistik mit LogisticsLab, 2. aktualisierte und komplett überarbeitete Auflage, De Gruyter, Berlin und Boston 2016.

This covers using SolverStudio and the CMPL modelling language. Mike Steglich has done a great job of adding CMPL support to SolverStudio; it is great to have SolverStudio as a core part of his new book.

For more information, including CMPL examples, see the Logistics Lab.

27 Apr

Quick patch for NEOS Incompatibility

You may find that SolverStudio (v 0.09.02 or earlier) is not working with NEOS. NEOS have recently tweaked their systems, and so you need to edit RunGAMSNEOS.py or RunAMPLNEOS.py and change all lines with “time.sleep(1)” into “time.sleep(5)”. This will be fixed in the next release. Andrew

17 Nov

SolverStudio 0.09.01 20150813 d – minor update

SolverStudio_00_09_01_00 20150813d has been released. This contains an IronPython patch to work around an IronPython 2.7.4 and 2.7.5 bug. This bug causes the error “SystemError: Handle is not initialized” in “_weakrefset.py”, line 73, within __contains__().
For more information, see https://mail.python.org/pipermail/ironpython-users/2015-April/017448.html and https://github.com/IronLanguages/main/issues/1187
Many thanks to SolverStudio user Andres Sommerhoff for following this up and suggesting this patch.

If you have not encountered this error, then there is no advantage in upgrading.

SolverStudio_00_09_01_00 20150813d.zip (6626 downloads) 32 MB

Note: The download file is named “SolverStudio_00_09_01_00 20150813d.zip”, with the “d” indicating the change to the IronPython “_weakrefset.py” file.

03 Sep

SolverStudio 0.09.01 (20150813) now with MOSEK examples

We have just (on 20150903) updated the latest SolverStudio download to the following file:

SolverStudio_00_09_01_00 20150813c.zip (10060 downloads) 32 MB

This is still the same underlying SolverStudio 09.01 release, but the download now includes a new example spreadsheet showing how the MOSEK solver can be used from SolverStudio. More information is available on the MOSEK language page.

Many thanks to Andrea Cassioli from MOSEK for working with us to explore how best to integrate MOSEK with SolverStudio, and creating the new examples and information page.