3.1.0

• Updated ASL to version 20160307: changelog.

• Optimization problems can now be read from .nl files and strings using ReadNLFile and ReadNLString respectively:

  mp::Problem p;
  ReadNLFile("diet.nl", p);

• Fixed building problem representation from .nl files with permuted indices (#92).

• Switched to CMake 3.3 to address issues with propagation of compiler options.

• Improved compatibility with Solaris (#88). Thanks to @gidden (Matthew Gidden).

• Updates to the ASL C API by Dominique Orban (#65).

• Made installation of documentation optional (#93).

• Added missing default values for arguments in the API documentation (#91).

• Implemented a workaround for a Google Test issue with GCC 6 (#86).

3.0.0

• Updated ASL to version 20151209.

• Documented common definitions: http://ampl.github.io/common.html (#33).

• Renamed nl.h to nl-reader.h. Including nl.h still works, but is deprecated and nl.h will be removed or re-purposed in the next version.

• [Breaking] Replaced fmt::StringRef with mp::NLStringRef in ReadNLString where both size and null-termination is required. This doesn't affect callers who passed C strings or std::string objects.

• [Breaking] Renamed the following previously undocumented symbols:

  • mp::sol::UNSOLVED -> mp::sol::UNCERTAIN
  • mp::expr::opcode -> mp::expr::nl_opcode
  • mp::expr::INT_DIV -> mp::expr::TRUNC_DIV

  The new symbols are now documented and part of the stable API.

• [Breaking] Improved safety of the NL handler API:

  • NLHandler now takes the second template argument, Impl, which specifies a class derived from NLHandler that receives notifications of unhandled constructs via the OnUnhandled method. If the latter is not provided, the default NLHandler::OnUnhandled method is called which reports unhandled constructs by throwing exceptions. For the old behavior use NullNLHandler (#84).

  • Added the NullNLHandler class that can be used as a base class when only a subset of constructs needs to be handled. Unhandled constructs will be ignored, not reported.

  • NLHandler::OnComplementarity now takes ComplInfo object instead of int as the third argument:

    void OnComplementarity(int con_index, int var_index, ComplInfo info);

  • NLHandler::OnIntSuffix and NLHandler::OnDblSuffix now take suf::Kind instead of int as the second argument:

    IntSuffixHandler OnIntSuffix(fmt::StringRef name, suf::Kind kind, int num_values);
    DblSuffixHandler OnDblSuffix(fmt::StringRef name, suf::Kind kind, int num_values);

• [Breaking] Update C++ Format to version 2.0 replacing fmt::StringRef with fmt::CStringRef where null-termination is required, namely ReadNLFile, ReadNLString, ReadError, BinaryReadError. This doesn't affect callers who passed C strings or std::string objects.

• [Breaking] Added NLHandler::EndInput which is called at the end of input.

• Experimental APIs for working with optimization problems (problem.h) and nonlinear expressions (expr.h).

• gjh now always returns structural sparsity pattern for Hessian, not only when dual values are provided (#77).

• Fixed building ASL on GCC 5 (#78).

• NL reader is no longer affected by the current locale (#75).

• Added NL reader examples: nl-example.cc (#74). Thanks to @baharev (Ali Baharev).

• Made AMPL GSL bindings compatible with GSL 2.1 (#70). Thanks to @opoplawski (Orion Poplawski).

• Fixed documentation issues (#45, #48, #66, #67, #71).

• Made handling of function evaluation errors more consistent between platforms (#57, #59).

• Fixed build issues (#54, #55, #62, #81, #87).

• ExprVisitor can now handle all expression types including string expressions (#51).

• Added support for variable and constraint names (#53).

• Better error handling in the simple ASL interface (#60).

• The Sulum solver interface is no longer actively supported because Sulum has been discontinued.

• Added support for common expressions to new solver interfaces.

• New solver interfaces (ilogcp, gecode, jacop, smpswriter, ssdsolver and sulum) don't use ASL any more.

• Fixed discovery of 64-bit ODBC libraries.

• Fixed compilation issues with MSVC11 (due to broken implementation of variadic templates there) and other versions.

IBM/ILOG CPLEX and CP Optimizers (ilogcp)

• Updated IBM/ILOG CPLEX CP Optimizer to version 12.6.2.

• New option failuredirectedsearchemphasis:

  Specifies the number of workers that use failure-directed search once it has started. The value does not have to be integer. For example, value 1.5 means that first worker spends 100% of the time by failure-directed search, second worker 50% and remaining workers 0%. Default = auto (depends on actual performance of the failure-directed search).

• New option dumpfile:

  Specifies the name of a file where to dump the model before solving it. This file name must have extension ".cpo". Default = "" (don't dump the model).

• New option exportfile:

  Specifies the name of a file where to export the model before solving it. This file name must have extension ".cpo". Default = "" (don't export the model).

• New option elementinferencelevel:

  Inference level for element (IloElement) constraints. Possible values:

  • default
  • low
  • basic
  • medium
  • extended

  The default value is default, which allows the inference strength of all element constraints to be controlled via defaultinferencelevel.

• New option warninglevel:

  Specifies the highest warning level to be displayed, all warnings higher than this level are masked. CP Optimizer warning levels run from 1 to 4, so setting this option to 0 turns off all warnings. Warnings issued may indicate potential errors or inefficiencies in your model. Default = 2.

• Don't try to retrieve dual solution for quadratically constrained problems in CPLEX.

LocalSolver (locsol)

• Update LocalSolver to version 5.0+: changes.
• Added the terse verbosity level which now maps to custom output. The normal verbosity level now maps to LocalSolver verbosity 1 (#46).
• Piecewise-linear term support (#46).
• Objective bound support via the bound objective suffix (#46).
• Fixed handling of initial values and bounds.
• Added interrupted status.
• Fixed a segfault when using the library built with a broken version of Apple LLVM version 4.2 of clang (#82)

2.1.0

Deprecated inclusion of nl.h. nl-reader.h should be used instead.

2.0.4

• Fix ASL build on GCC 5 (#78)
• Updates to the ASL C API by Dominique Orban (#65)

2.0.3

Fix compilation error on OS X Yosemite (#55).

2.0.2

Fix compilation error on OS X and clang.

2.0.1

Updated versions of libmp.so and libasl.so that were incorrectly set to 1.4.0 in release 2.0.0.

2.0.0

General

• The NL reader API is now stable
• AMPL Solver Library version 20150318: changelog
• New C API for a subset of ASL functions contributed by Dominique Orban (#36)
• Improved type safety of expression API (#35)
• Added AMPL_LIBRARY_DIR CMake variable which specifies a directory to install AMPL function libraries relative to ${CMAKE_INSTALL_PREFIX} (#32)
• .mex files are now installed in the same directory as shared libraries (#27, #32)
• Fixed detection of floating-point arithmetic on non-x86 architectures (#25)
• Changed OS X deployment target to 10.7 for compatibility with older systems
• Fixed issues with the documentation (#31, #39, #41, #42, #43, #44)
• Migrated the documentation from ReadTheDocs to GitHub Pages for better stability and performance

LocalSolver

• Updated to version 5.0

• The normal verbosity is now mapped to LocalSolver verbosity=1 and terse to custom output

• Added support for piecewise-linear terms:

  var x;
  minimize o: <<0; -1, 1>> x;
  option pl_linearize 0;
  option solver localsolver;
  solve;

  The new option pl_bigm controls the artificial bound used for unbounded variables in piecewise-linear terms.

• Objective bound can now be specified with the bound suffix:

  suffix bound;
  minimize o: sum{i in 1..NumOrders} WastedSteel[i] suffix bound 0;

Gecode

• Updated to version 4.4.0: changes

COIN-OR Solvers

• Clp 1.16.4
• Cbc 2.9.3
• Ipopt 3.12.1
• Bonmin 1.8.1
• Couenne 0.5.3

Open-source solver binaries are available for download from the AMPL Open-Source Downloads page.

1.3.0

General

• New nl reader: source, docs
• New versioning scheme (Issue #17)
• AMPL Solver Library version 20150107: changelog
• gen-expr-info and arithchk are no longer run at build time when cross-compiling to x86 and x86_64 (Issue #9).

Gecode

• Updated to version 4.3.2.

LocalSolver

• Improved solution log when verbosity=normal:

  localsolver 4.5: verbosity=normal

                    |                Moves               |
    Time       Iter |    Total  Infeas  Accepted  Improv |    Obj
      1s      18363      35861    0.3%    4.4%       350        0
      2s      60215     120018    0.4%    5.7%       361        0
      3s     119254     237600    0.4%    5.3%       362        0

• Report the time when the best solution was found.

Binaries are available for download from the AMPL Open-Source Downloads page.

20141208

Compute function value in case of derivative evaluation error in AMPLGSL.