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NLopt Release Notes

NLopt 2.10.1

9 February 2026

  • Fixed octave 10.x build (#616).

  • Fixed slsqp constraints count (#598).

  • Fixed build with libstdc++ debug iterators (#627).

  • Fixed PRAXIS evaluations count (#606).

NLopt 2.10

4 February 2025

  • New Java bindings (#578).

  • Allow disabling exceptions with set_exceptions_enabled (#580).

  • Configurable tolg tolerance parameter for Luksan gradient stopping condition (#585).

  • Restored LD_LBFGS_NOCEDAL enum value (dropped in 2.9) to ease backwards compatibility for wrappers in other languages (though this algorithm is currently unimplemented) (#587).

NLopt 2.9.1

25 November 2024

  • Fixed PRAXIS box constraints (#528)

NLopt 2.9

10 November 2024

  • New NLOPT_LUKSAN cmake option to build without Luksan LGPL code (#568).

  • Dropped unused LD_LBFGS_NOCEDAL enum value.

  • Python 3.13 support (#565).

  • Fixed COBYLA not returning the optimum (#57)

  • Fixed SLSQP returning infeasible optimum (#368)

  • Fixed STOGO not registering new optimum (#504)

  • Various minor bugfixes (#570, #563, #379, #511)

NLopt 2.8

9 August 2024

  • Support C++ functors for objective functions (#457).

  • CCSA/MMA an now use the initial_step parameter to bound their initial stepsize, and also expose a new internal parameter rho_init (#561).

  • Install pkg-config file on Windows (#534).

  • Allow having more equality constraints than there are variables (#509).

  • Bugfixes to nlopt_algorithm_name (#558), Matlab NLOPT_GN_AGS (#533), forced stop for empty dimensions (#473), SLSQP (#465), and build improvements (#551, #535,#510, #445…).

NLopt 2.7.1

3 December 2021

  • Various minor bugfixes (#268, #409, #420) and build improvements (support Octave 6.x, Guile 3.x, Cmake 3.2).

NLopt 2.7

18 November 2020

  • New nlopt_set_param API for setting internal algorithm parameters (#365).

  • Avoid library-symbol conflicts (#355, #361)

NLopt 2.6.2

15 April 2020

  • Fixed forced stop exception with dimension elimination (#317)

  • Fixed get_initial_step wrapping (#319)

  • Various build fixes (#314, #308, #303, #278)

NLopt 2.6.1

13 April 2019

  • Fix nlopt_version result for 2.6.x and update soname.

NLopt 2.6

12 April 2019

  • New nlopt_set_upper_bound and nlopt_set_lower_bound functions in the low-level C API to set one bound at a time (#257).

  • There is no longer a separate libnlopt_cxx library: C++ algorithms (STOGO and AGS) are compiled and included by default (#198).

  • Various build fixes (#197, #216, #245, #250, #230, #261, etc.), other fixes (#242, #258).

NLopt 2.5

26 July 2018

  • New AGS global solver (#194), thanks to Vladislav Sovrasov.

  • New nlopt_get_numevals function providing a built-in evaluation counter (#160).

  • New nlopt_get_errmsg function for more descriptive error messages.

  • Build system is converted to cmake (#49), thanks to Julien Schueller

  • Plugins updated for recent Octave and Guile versions.

  • Various other build fixes and minor bug fixes.

NLopt 2.4.2

20 May 2014

  • Fix CRS for empty dimensions (where lower == upper bound) (issue #13).

  • Improvements to CMake (thanks to @xantares) and Windows builds (issue #12).

  • Fix guile2 compatibility (issue #21).

NLopt 2.4.1

19 November 2013

  • Use cdecl calling convention instead of stdcall on Win32, to simplify shared-library usage and for consistency with Win64.

NLopt 2.4

2 November 2013

  • New genetic algorithm ESCH, thanks to Carlos Henrique da Silva Santos.

  • Fix swig dir for VPATH builds, thanks to Sandro Vitenti for the bug report.

  • Use python-config program in the configure script to find the include directories for Python, if possible (may be overridden by PYTHON_CONFIG environment variable).

  • Bugfix in copy constructor for C++ and Python interfaces.

  • Bugfix in return value for setting min/max objective.

  • Handle negative rescalings in COBYLA and BOBYQA.

  • Plugin installation honors the configure --prefix, if any (thanks to xantares@github).

  • Various compilation fixes for compatibility with recent software.

NLopt 2.3.1

16 September 2012

  • Bug fix: COBLYA should return ROUNDOFF_LIMITED rather than XTOL_REACHED if the trust-region radius underflows to zero; thanks to David Liu.

  • Bug fix: incorrect return value from set min/max objective.

  • Handle case of negative rescalings (from negative dx) in COBYLA and BOBYQA; thanks to Alexander Law for the bug report

NLopt 2.3

20 July 2012

  • In Matlab/Octave interface, make returning NaN from the objective equivalent to nlopt_force_stop; thanks to Norman Violet for the suggestion.

  • Added CCSA-quadratic (NLOPT_LD_CCSAQ), similar to MMA.

  • Added interface for supplying a preconditioner (approximate Hessian); currently only supported in CCSAQ.

  • When adding mconstraints, allow tol==NULL as synonym for zero tolerances.

  • Added missing NLOPT_LD_SLSQP constant in Matlab/Octave.

  • Lower tolerance for dual optimization in MMA/CCSAQ; thanks to Christophe Leruste for the problem report

  • Fixed bug in timer, thanks to William Vaughn for the patch.

  • Bug fix to convergence test in sbplx; thanks to Douglas Bates.

NLopt 2.2.4

9 June 2011

  • Fixed linking problem for C++ and Python shared libraries on MacOS X; thanks to Volker Lorrmann for the bug report.

NLopt 2.2.3

8 June 2011

  • Fixed additional re-entrancy problem in Luksan algorithms missed in the previous version; thanks to Gert Wollny for the bug report.

  • Fixed set/get vector_storage in Fortran interface for Fortran compilers with all-uppercase linkage.

NLopt 2.2.2

26 May 2011

  • Added set_vector_storage API to modify the memory usage and the subspace dimension for low-storage quasi-Newton methods.

  • Fixed missing support for maxtime stopping criteria in Luksan and ORIG_DIRECT algorithms; thanks to Jurgen Werner for the bug report.

  • Fixed algorithms to support the case where the lower and upper bounds are equal for some variables (which effectively eliminates those variables from optimization).

  • Added missing xtol check to SLSQP, which caused erroneous ROUNDOFF_LIMITED error codes to be returned; thanks to Alexander Riess for the bug report.

  • Fixed slight overcounting of function evaluations for maxeval check in SLSQP.

  • Fixed deprecated API to support xtol_abs == NULL for backward compatibility (thanks to Francesco Biscani for the bug report).

  • Made Luksan algorithms (e.g. LBFGS and other quasi-Newton methods) re-entrant; thanks to Gert Wollny for the bug report. (Fixes Gentoo bug #368685.)

  • Fixed bug in DIRECT (not ORIG_DIRECT), where a typo caused suboptimal convergence in some cases; thanks to Sinisa Hristov for the bug report.

NLopt 2.2.1

6 September 2010

  • If you compile nlopt.h with the NLOPT_DLL_EXPORT symbol #defined, it now uses the dllexport directive (under Windows), useful for compiling an NLopt DLL under Microsoft compilers; thanks to Benoit Scherrer for the suggestion.

  • Handle case where copysign function is missing, e.g. on Windows; thanks to Benoit Scherrer for the bug report.

  • Remove C99-style mixed declaration and code in a couple files, so that code compiles in C89; thanks to Benoit Scherrer for the bug report.

  • Removed a few compiler warnings under Microsoft compilers; thanks to Benoit Scherrer for the bug report.

  • Export nlopt_get_algorithm_name function on Windows; thanks to Ofek Shilon for the bug report.

  • Don't use dllimport directive with lcc on Windows (which doesn't support it); thanks to Laurent Vanbeylen for the bug report.

  • Update Nodedal README directory to indicate that Nocedal's LBFGS code is now available under the GPL, and therefore may be distributed with a future NLopt version (although Luksan's LBFGS code already works well).

  • Bug fix in set/get_xtol_abs; thanks to David Rivest-Henault for the report.

NLopt 2.2

15 July 2010

  • Added SLSQP algorithm for gradient-based local optimization with nonlinear constraints via sequential quadratic programming, based on the implementation by Dieter Kraft that was adapted for SciPy.

  • Modified BOBYQA and COBYLA algorithms to support unequal initial step sizes in different directions; thanks to Tom Fiddaman for pointing out the need for this in the case where different directions have very different scales.

  • Added Python module docstring; thanks to Sebastian Walter for the suggestion.

  • Added GUILE_INSTALL_DIR variable to allow the user to change the Guile installation directory.

  • Added Fortran interface for vector-valued constraints.

  • Throw correct exceptions in Python for the add_*constraint functions; thanks to Dmitrey Kroshko for the bug report.

  • Support forced stop and exceptions in ORIG_DIRECT algorithm.

  • Remove arbitrary 1e20 upper bound on function values from ORIG_DIRECT code.

  • Bugfix in C++ interface (and some other language front-ends) when deallocating the nlopt_opt object in cases like MLSL where local_optimizer is used; thanks to Jurgen Werner for the bug report.

NLopt 2.1.2

8 July 2010

  • The Python mconstraint (vector-valued constraint) functions now pass a 2-dimensional array for the gradient argument, rather than a flattened 1d array.

  • Improved handling of exceptions and forced stops for constrained optimization, making sure that no constraints are evaluated after the stop.

  • Return an NLOPT_INVALID_ARGS error if more than n equality constraints are added in an n-dimensional problem.

  • Fix bug that could cause spurious NLOPT_INVALID_ARGS errors when adding constraints under rare circumstances.

  • Eliminate a few small memory leaks that could occur under error conditions.

NLopt 2.1.1

7 July 2010

  • More robust configure check for Python include directories, via distutils.sysconfig.get_python_inc() and numpy.get_include(). Thanks to Nathaniel Smith for the tip.

  • Bug fix in Guile interface: added missing prefix to nlopt-version-major etcetera.

NLopt 2.1

6 July 2010

  • New vector-valued constraint feature; thanks to Dmitrey Kroshko of OpenOpt for the suggestion.

  • COBYLA now accepts equality constraints.

  • Guard against multiple inclusion in nlopt.hpp; thanks to Saul Thurrowgood for the suggestion.

NLopt 2.0.2

17 June 2010

  • Fixed compilation failure in Microsoft Visual Studio, due to incorrect usage of __stdcall keyword; thanks to Dave Katz for the bug report.

NLopt 2.0.1

16 June 2010

  • Bug fix in Fortran API (for nlo_get_ functions returning arrays).

  • Fixed buggy compilation with MinGW.

NLopt 2.0

15 June 2010

  • New C API, that works by creating an nlopt_opt "object" and then calling functions to set the optimization parameters — much more extensible than the old API (which is preserved for backwards compatibility). (Updated Fortran, Matlab, and GNU Octave wrappers as well.)

  • C++ nlopt.hpp wrapper around C API, allowing namespaces, object constructors/destructors, std::vector<double>, and exceptions to be exploited.

  • New nlopt wrappers callable from Python and GNU Guile, generated with the help of SWIG.

  • New man nlopt manual page documenting new API.

  • New AUGLAG algorithm(s) implementing an augmented-Lagrangian method proposed by Birgin and Martinez (2008), which supports nonlinear equality and inequality constraints "wrapped around" other local/global optimization methods.

  • Added API for nonlinear equality constraints (currently only supported by AUGLAG and ISRES algorithms).

  • Support inequality constraints directly in ORIG_DIRECT algorithms (no need to return NaN when constraint is violated).

  • Inequality/equality constraints now have optional tolerances that are used as conditions in stopping criteria.

  • Pseudo-randomize simplex steps in COBYLA algorithm, improving robustness by avoiding accidentally taking steps that don't improve conditioning (which seems to happen sometimes with active bound constraints). The algorithm remains deterministic (a deterministic seed is used), however.

  • Allow COBYLA to increase the trust-region radius if the predicted improvement was approximately right and the simplex is OK, following a suggestion in the SAS manual for PROC NLP that seems to improve convergence speed.

  • Added nlopt_force_stop function to force a (graceful) halt to the optimization, and corresponding NLOPT_FORCED_STOP return code.

  • Improved thread-safety in random-number generation: thread-local storage is used for random-number state, on compilers that support it (e.g. gcc, Intel, Microsoft), to make the generation thread-safe. In this case, the random-number seed must be set per-thread.

  • Return an error in global-search algorithms if the domain is not finite.

  • Use stdcall convention on Windows; thanks to Alan Young for the suggestion.

  • Added missing absolute-tolerance criteria in Luksan algorithms; thanks to Greg Nicholas for the bug report.

  • Fixed compilation under C++, and use C++ compiler for everything in --with-cxx mode; thanks to Greg Nicholas for the bug report.

  • In MMA, only stop at minf_max/stopval if the point is feasible.

  • Fix Matlab mex file to not include unnecessary nlopt-util.h file, simplifying Windows compilation.

NLopt 1.2

18 November 2009

  • Added Powell's BOBYQA algorithm for box-constrained optimization without derivatives, an improvement on NEWUOA.

  • Added ISRES genetic algorithm, supporting nonlinearly constrained global optimization.

  • New functions nlopt_{set/get}_stochastic_population to provide optional greater control over the random "population" sizes in stochastic algorithms (although it still has a sensible default).

  • Bug fix: remove extraneous text accidentally included in nlopt.f Fortran include file.

  • Bug fix: configure script now correctly handles Matlab installation when MEX_INSTALL_DIR is specified manually by the user.

NLopt 1.1

12 November 2009

  • configure script detects whether --enable-shared is required in order to compile Matlab and Octave plugins (as is the case on x86_64), and disables compilation of those plugins if --enable-shared is not used.

  • Added --without-octave and --without-matlab configure options to disable Octave and Matlab plugins, respectively.

  • Modified COBYLA algorithm to have better support for bound constraints.

  • Added new NLOPT_ROUNDOFF_LIMITED failure code to indicate cases in which optimization breaks down due to roundoff errors, in which case it is possible that useful results were obtained.

  • Experimental support for nonlinear equality constraints via augmented-Lagrangian method.

  • Support for compiling under Windows (ideally with MinGW) as a DLL, although you have to manually add #define NLOPT_DLL to nlopt.h after installing (after compiling NLopt).

  • Added several checks for roundoff-related breakdown to NEWUOA code.

  • When only a relative error tolerance is specified, no longer fails to halt when exact convergence to zero is obtained.

  • Workaround for incompatible qsort_r functions in BSD and GNU libc by always using my own version; thanks to Wendy Vandoolaeghe and Philippe Preux for the bug report and explanation.

  • Workaround for gcc 3.4.x conflict with HUGE_VAL definition in Solaris (gcc bug 19933).

  • Better identification of Matlab-plugin installation directory.

  • Fixed identification of Octave-plugin installation directory for recent Octave versions.

NLopt 1.0.1

13 Nov. 2008

  • Allow user to override Matlab-plugin installation directory with MEX_INSTALL_DIR.

  • Bug fix in my DIRECT code that prevented convergence (DIRECT-L unaffected).

  • MLSL needs a nonzero default ftol_rel and/or xtol_rel to ensure that its local searches terminate; use roughly machine precision as defaults.

NLopt 1.0

11 Nov. 2008

  • Initial public release.