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News & Events Archive

21-24 July 2014

11th Mixed Integer Programming Workshop
Columbus, Ohio, U.S.A.

AMPL sponsorship of this event


13-18 July 2014

IFORS 2014: 20th Conference of the International Federation of Operational Research Societies
Barcelona, Spain

AMPL booth in the exhibit area


SIAM

19-22 May 2014

SIAM Conference on Optimization
San Diego, California, U.S.A.

AMPL sponsorship of this event
AMPL table in the exhibit area


9-11 April 2014

APMOD 2014: International Conference on Applied Mathematical Optimization and Modelling
Coventry, U.K.

AMPL sponsorship of this event

Bob Fourer of AMPL Optimization is a member of the Program Committee and is organizing sessions on Optimization Modeling Languages and Software


30 March-1 April 2014

2014 INFORMS Conference on Business Analytics & Operations Research
Boston, Massachusetts, U.S.A.

AMPL booth in the exhibit area

Session MD11: Software Tutorials, Monday, March 31, 13:50-14:40

  • Robert Fourer,
    New AMPL Interfaces for Enhanced Development and Deployment of Optimization Models

6-8 March 2014

6th INFORMS Optimization Society Conference
Houston, Texas, U.S.A.

AMPL sponsorship of this event
AMPL table in the exhibit area


6-9 October 2013
Informs Annual Meeting, Minneapolis, Minnesota, U.S.A.

AMPL booth in the exhibit area

Session MC29: Software Demonstrations, Monday, October 7, 13:30-15:00

Session TD08: Constraint Programming III, Tuesday, October 8, 16:30-18:00


16-20 September 2013
CP 2013: 19th International Conference on Principles and Practice of Constraint Programming, Uppsala, Sweden

AMPL sponsorship of this event

Workshop on CP Solvers: Modeling, Applications, Integration, and Standardization, Monday, September 16, 15:00-15:25


3-6 September 2013
OR 2013: International Conference of the German and Dutch OR Societies, Rotterdam, The Netherlands

AMPL booth in the exhibit area

AMPL sponsorship of this event


29 July – 1 August 2013
4th International Conference on Continuous Optimization, Caparica, Portugal

Session Thu.A.23: Extending the Power and Expressiveness of Optimization
Modeling Languages,
Thursday, August 1, 9:00-10:30


8-12 July 2013
13th International Conference on Stochastic Programming, Bergamo, Italy

Solvers for Stochastic Optimization, Wednesday, July 10, 10:45-12:50

Computational SP Including Risk Management and Energy Applications, Thursday, July 11, 14:00-16:25

  • Gautam Mitra, Victor Zverovich, Christian Valente,
    Formulation and Solver Support for Optimisation under Uncertainty

1-4 July 2013
EURO-INFORMS Joint International Meeting, Rome, Italy

AMPL booth in the exhibit area

Session TB56: Optimization Modeling I, Tuesday, July 2, 10:30-12:00

Session WB9: Sponsor Presentations, Wednesday, July 3, 10:30-12:00


18-22 May 2013
CPAIOR 2013: 10th International Conference on Integration of Artificial Intelligence and Operations Research Techniques in Constraint Programming, Yorktown Heights, New York, U.S.A.

Late Breaking Abstracts, Wednesday, May 22, 16:00-17:00


7-9 April 2013
INFORMS Conference on Business Analytics & Operations Research, San Antonio, Texas, U.S.A.

AMPL booth in the exhibit area

Track 11: Software Tutorials, Monday, April 8, 13:50-14:40


6-8 January 2013

13th INFORMS Computing Society Conference

Santa Fe, New Mexico, U.S.A.

AMPL sponsorship of this event

Conference theme: Modeling and Analytics for the Real World

Bob Fourer of AMPL Optimization is the stream chair for
Modeling Languages and Systems.

Optimization Modeling: Alternative Interfaces, Sunday, January 6, 16:30-18:00

Optimization Modeling: Algebraic Languages, Tuesday, January 8, 16:30-18:00


“Logic” and Constraint Programming Extensions

22 October 2012: The AMPL language has been extended in a variety of ways to take better advantage of constraint programming and mixed-integer programming solvers that deal directly with “logic” in constraints of various kinds. Among these extensions are basic logical operators (and, or, not, exists, forall), conditional operators (if ... then ..., ==>), counting operators (count, atleast, atmost), and operators that facilitate so-called global constraints (alldiff, numberof).

Many of the extended operators are recognized by a new AMPL driver for the ILOG Concert Technology C++ interface to the IBM ILOG CP constraint programming optimizer and also the IBM CPLEX mixed-integer programming optimizer. This driver is available to all registered CPLEX for AMPL users including academic and trial license users.

See our new logic extensions page for a syntax and usage summary of all of the extended operators recognized by the new ilogcp driver.


Free Extended Function Library

22 October 2012: A new, free function library extends AMPL with over 300 functions chosen from the GNU Scientific Library. Included are scientific, statistical, and utility functions of many kinds, and a variety of random number generators.

Once installed and declared, these functions may be applied to any arguments anywhere in an AMPL model or script. When applied to variables in objectives or constraints, they are sent to solvers, which automatically gain access to them. Thus solvers that rely on function evaluations can optimize over expressions that use this library.


FICO

Xpress for AMPL Now Available

15 October 2012: FICO Xpress version 23 for linear, mixed integer, and quadratic programming is now available for purchase with an AMPL interface, directly from AMPL Optimization. A complete, udpated Xpress option listing details settings for access to all of the Xpress solver features. With this addition, we now offer a choice among all of the best MIP optimizers; free trials are available for benchmarking.


14-17 October 2012

INFORMS Annual Meeting

Phoenix, Arizona, U.S.A.

AMPL booth in the exhibit area
Bob Fourer of AMPL Optimization has organized 3 sessions on Advances in Optimization Modeling Languages and Systems

Session SA15: Software Tutorials, Sunday, October 14, 8:00-9:30

Session SD72: Advances in Optimization Modeling Languages and Systems I, Sunday, October 14, 16:30-18:00

  • Jared Erickson and Robert Fourer,
    Automated Conversion of Common Optimization Problem Structures to Mixed-Integer Linear Programs


4-7 September 2012
OR 2012: International Annual Conference of the German Operations Research Society, Hannover, Germany

AMPL booth in the exhibit area

Invited Talk, to be scheduled


AMPL Book Chapters Now Free Online

28 August 2012: We are pleased to announce that chapters of “AMPL: A Modeling Language for Mathematical Programming” are now freely available for download. This offering became possible through a recent agreement with the book’s publisher, who will continue to make hardbound books available for purchase.


19-24 August 2012
21st International Symposium on Mathematical Programming, Berlin, Germany

AMPL booth in the exhibit area

Bob Fourer of AMPL Optimization has organized 3 sessions on Modeling Languages and Software

Modeling Languages and Software I, Thursday, August 23, 10:30-12:00


23-27 July 2012
6th International Conference on Automatic Differentiation, Fort Collins, Colorado, U.S.A.

Poster Presentation 5


8-11 July 2012
25th European Conference on Operational Research, Vilnius, Lithuania

AMPL booth in the exhibit area

Session WD-33: Optimization Modeling II, Wednesday, July 11, 14:30-16:00


24-27 June 2012
INFORMS International Conference, Beijing, China

AMPL booth in the exhibit area

AMPL sponsorship of this event

Session TB20: Software Tutorials, Tuesday, June 26, 11:00-12:30


Victor Zverovich Joins AMPL Optimization

1 June 2012: AMPL Optimization is pleased to welcome Victor Zverovich as the newest member of the AMPL team. Victor’s skills will play a key role in the development of the next generation of AMPL products.

Victor is a specialist in mathematical optimization. In 2011 he completed his PhD in Mathematics at Brunel University, UK. His main research interests are stochastic programming and algebraic modeling languages. During and after his PhD Victor worked at OptiRisk Systems on a stochastic programming solver, stochastic extensions to AMPL and an integrated development environment for those extensions. Victor has a first class honors degree in Mathematics from Belarusian State University and many years of software development experience.


Gurobi

Gurobi 5.0 for AMPL Now Available

15 May 2012: Gurobi version 5.0 for linear, mixed integer, and quadratic programming is now available for purchase with an AMPL interface, both directly through us and from Gurobi Optimization. This version adds support for quadratic constraints and a variety of performance enhancements. Accounts that are up-to-date on Gurobi for AMPL maintenance and support service can download this major update immediately; other should contact licensing@ampl.com for information.

IBM Partner

CPLEX 12.4 for AMPL Now Available

15 May 2012: IBM ILOG CPLEX version 12.4 for linear, mixed integer, and quadratic programming is now available for purchase with an AMPL interface, directly from AMPL Optimization. Accounts that are up-to-date on CPLEX for AMPL maintenance and support service can download this significant update immediately; other should contact licensing@ampl.com for information.


April 15-17, 2012
INFORMS Conference on Business Analytics & Operations Research, Huntington Beach, California, U.S.A.

AMPL booth in the exhibit area

Track 22: Software Tutorials, Tuesday, April 17, 10:30-11:20


March 28-30, 2012
APMOD 2012: International Conference on Applied Mathematical Optimization and Modelling, Paderborn, Germany

AMPL sponsorship of this event


February 24-26, 2012
4th INFORMS Optimization Society Conference, Coral Gables, Florida

AMPL sponsorship of this event

Session SB01: Software for Optimization Modeling, Saturday, February 25, 10:30-12:00


2 December 2011
Gurobi Optimizer Solutions Seminar, Tokyo, Japan

Invited presentation, Friday, December 2, 13:20-14:35


29-30 November 2011
International Symposium on Mathematics of Logistics: Theory and Practice, Tokyo, Japan

Invited presentation, Tuesday, November 29, 11:00-12:00


13-16 November 2011

INFORMS Annual Meeting

Charlotte, North Carolina, U.S.A.

AMPL booth in the exhibit area

Session SB03: Optimization Software, Sunday, November 13, 11:00-12:30

Session TC10: Software Demonstrations, Tuesday, November 15, 13:30-15:00


6-8 September 2011
OR53: Annual Conference of the OR Society, Nottingham, United Kingdom

Track 11: Optimisation Keynote, Thursday, Sept 8, 14:00-15:00


6 September 2011
Very Large Scale Optimization: A Conference in Honor of Etienne Loute, Brussels, Belgium

Invited presentation, Tuesday, September 6, 14:45-15:30


30 August – 2 September 2011
OR 2011: International Conference on Operations Research, sponsored by the German, Austrian, and Swiss OR societies, Zurich, Switzerland

AMPL booth in the exhibit area

Session TC-22: Advances in Modeling Languages, Thursday, Sept 1, 11:30-13:00


10-15 July 2011
IFORS 2011: 19th Triennial Conference of the International Federation of Operational Research Societies, Melbourne, Australia

AMPL booth in the exhibit area

Session MC-7: OR Software, Monday, July 11, 16:15-17:45


IBM Partner

CPLEX 12.3 for AMPL Now Available

12 June 2011: IBM ILOG CPLEX version 12.3 for linear, mixed integer, and quadratic programming is now available for purchase with an AMPL interface, directly from AMPL Optimization. Those who have purchased earlier versions from us can also arrange to download this update; contact licensing@ampl.com if you need to set up a download account.


23-27 May 2011
CPAIOR 2011: 8th International Conference on Integration of Artificial Intelligence and Operations Research Techniques in Constraint Programming for Combinatorial Optimization, Berlin, Germany

AMPL sponsorship of this event

Bob Fourer of AMPL Optimization will be attending.


16-19 May 2011
SIAM Conference on Optimization, Darmstadt, Germany

AMPL sponsorship and booth in the exhibit area

David Gay of AMPL Optimization will be attending.


Gurobi

Gurobi 4.5 for AMPL Now Available

15 April 2011: Gurobi version 4.5 for linear, mixed integer, and quadratic programming is now available for purchase with an AMPL interface, both directly through us and from Gurobi Optimization. Those who have purchased earlier versions from us can also arrange to download this update; contact licensing@ampl.com if you need to set up a download account.


10-12 April 2011
INFORMS Conference on Business Analytics and Operations Research, Chicago, Illinois, U.S.A.

AMPL booth in the exhibit area

Workshop: Ziena Optimization, Sunday, April 10, 9:10-10:00

Track 19: Software Tutorials, Tuesday, April 12, 12:45-13:10


9-11 January 2011

12th INFORMS Computing Society Conference, Monterey, California, U.S.A.

Bob Fourer of AMPL Optimization will be attending.


4-7 January 2011

CMIC-2011: Chiang Mai University Int’l Conference, Chiang Mai, Thailand

Workshop, Tuesday-Wednesday, January 4-5

Keynote presentation,


18-19 November 2010

85th GOR Working Group on Real World Optimization:
Modelling Languages in Mathematical Optimization, Bad Honnef, Germany

Developer presentation, Friday, November 19, 09:15-10:15


7-10 November 2010

INFORMS Annual Meeting,
Austin, Texas, U.S.A.

AMPL booth in the exhibit area

INFORMS Roundtable: OR in the Cloud, Sunday, November 7

Session SA18: Optimization Modeling, Sunday, November 7, 8:00-9:30

  • Barry King and Terri Friel,
    Class Rostering at Roosevelt University using AMPL and LPsolve

Session SD48: Exhibitor Presentations, Sunday, November 7, 16:30-18:00

Session MC33: Algorithms & Solvers for SOCP & Stochastic SDP, Monday, November 8, 13:30-15:00

Session MD18: Modeling Languages II, Monday, November 8, 16:30-18:00

Session TC40: Solver Interface APIs I, Tuesday, November 9, 13:30-15:00


Knitro

KNITRO 7.0 for AMPL Now Available

13 October 2010: KNITRO version 7.0 for nonlinear optimization in continuous and integer variables is now available for purchase with an AMPL interface, both directly through us and from Ziena Optimization. Those who have purchased earlier versions from us can also arrange to download this update; contact licensing@ampl.com if you need to set up a download account.


26-28 September 2010
What a Pivot: Workshop Honoring the 65th Birthday of Bob Bixby, Erlangen, Germany

Presentation, Monday, September 27


Full-Featured MIP Solvers Available Free for Academic Use

20 September 2010: The AMPL-enabled versions of two popular mixed-integer optimizers are now available free for teaching and research at degree-granting academic institutions. These are full-featured versions that impose no arbitrary limits on problem size.

Gurobi may be included as a no-cost item on any academic license order. Those who already have AMPL academic licenses can contact us to arrange to add Gurobi, or can download solver software and academic licenses free of charge from the Gurobi website; see our Gurobi download instructions for details.

CPLEX for AMPL can be obtained without charge through the IBM Academic Initiative; see our CPLEX download instructions for details.


Purchase CPLEX for AMPL Directly From Us

15 September 2010: CPLEX for linear, quadratic, and mixed-integer programming has joined the lineup of AMPL-enabled solvers available for purchase directly from AMPL Optimization LLC. Version 12.2 is currently shipping. Contact us at info@ampl.com for pricing on single-user, floating, and server licenses. Full-featured trials are also available.


1-3 September 2010
OR 2010: German OR Society Annual International Conference, Munich, Germany

Semi-plenary presentation, Wednesday, September 1, 13:30-14:15


16-20 August 2010
SP XXI: 12th International Conference on Stochastic Programming,
Halifax, Nova Scotia, Canada

AMPL table in the exhibit area

Session RB2: Solution Algorithms for Stochastic Programming,
Thursday, August 19, 10:00-11:40

  • Christian Valente,
    Extensions to the SP Modelling System SPInE/SAMPL

Session RC4: Software and Modelling Tools for Stochastic Programming I,
Thursday, August 19, 13:20-15:00


11-14 July 2010
EURO XXIV: 24th European Conference on Operational Research,
Lisbon, Portugal

AMPL booth in the exhibit area

Session MC21: Optimization Modeling I, Monday, July 12, 12:20-13:40

  • Robert Fourer and David M. Gay,
    Attacking Hard Mixed-Integer Optimization Problems Through the AMPL Modeling Language
  • Andreas Grothey, Jacek Gondzio, Marco Colombo, Kristian Woodsend and Jonathan Hogg,
    A Structure-Conveying Modelling Language for Mathematical and Stochastic Programming

Session TB21: Optimization Modeling V, Tuesday, July 13, 10:40-12:00

  • Alexandra Newman,
    Efficient Mixed Integer Programming Formulations in Energy and Mining

Session WD35: Mixed-Integer Nonlinear Programming – Problem-Specific Approaches, Wednesday, July 14, 14:00-15:20

  • David M. Gay,
    On Bound Computations for MINLP

6-9 June 2010
ALIO-INFORMS Joint International Meeting, Buenos Aires, Argentina

AMPL table in the exhibit area

Session TB08: Modeling Languages for Optimization, Tuesday, June 8, 11:30-13:00

Session WC08: OR in Practice III – Modeling, Wednesday, June 9, 13:20-14:50


18-20 April 2010
INFORMS Conference on OR/MS Practice, Orlando, Florida, U.S.A.

AMPL booth in the exhibit area

Track T9: Software Tutorials, Monday, April 19, 15:40-16:30


Gurobi 3.0 for AMPL Now Available

15 April 2010: Gurobi version 3.0 for linear and mixed integer programming is now available for purchase with an AMPL interface, both directly through us and from Gurobi Optimization.