NLopt release notes
Here, we describe what has changed between releases of the NLopt package. You can also refer to the
NEWS file in the Meep package (or the
ChangeLog file for a more detailed listing).
- Using CMake build system instead of autotools
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).
19 November 2013
- Use cdecl calling convention instead of stdcall on Win32, to simplify shared-library usage and for consistency with Win64.
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.
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==NULLas synonym for zero tolerances.
- Added missing
NLOPT_LD_SLSQPconstant 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.
9 June 2011
- Fixed linking problem for C++ and Python shared libraries on MacOS X; thanks to Volker Lorrmann for the bug report.
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_storagein Fortran interface for Fortran compilers with all-uppercase linkage.
26 May 2011
set_vector_storageAPI to modify the memory usage and the subspace dimension for low-storage quasi-Newton methods.
- Fixed missing support for
maxtimestopping criteria in Luksan and
ORIG_DIRECTalgorithms; 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
xtolcheck to SLSQP, which caused erroneous
ROUNDOFF_LIMITEDerror codes to be returned; thanks to Alexander Riess for the bug report.
- Fixed slight overcounting of function evaluations for
maxevalcheck in SLSQP.
- Fixed deprecated API to support
NULLfor 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.
6 September 2010
- If you compile
#defined, it now uses the
dllexportdirective (under Windows), useful for compiling an NLopt DLL under Microsoft compilers; thanks to Benoit Scherrer for the suggestion.
- Handle case where
copysignfunction 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.
nlopt_get_algorithm_namefunction on Windows; thanks to Ofek Shilon for the bug report.
- Don't use
lccon Windows (which doesn't support it); thanks to Laurent Vanbeylen for the bug report.
- Update Nodedal
READMEfile 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
get_xtol_abs; thanks to David Rivest-Henault for the report.
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.
GUILE_INSTALL_DIRvariable 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_*constraintfunctions; thanks to Dmitrey Kroshko for the bug report.
- Support forced stop and exceptions in
- Remove arbitrary 1020 upper bound on function values from ORIG_DIRECT code.
- Bugfix in C++ interface (and some other language front-ends) when deallocating the
nlopt_optobject in cases like MLSL where
local_optimizeris used; thanks to Jürgen Werner for the bug report.
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_ARGSerror if more than n equality constraints are added in an n-dimensional problem.
- Fix bug that could cause spurious
NLOPT_INVALID_ARGSerrors when adding constraints under rare circumstances.
7 July 2010
- More robust
configurecheck for Python include directories, via
numpy.get_include(). Thanks to Nathaniel Smith for the tip.
- Bug fix in Guile interface: added missing prefix to
6 July 2010
- New vector-valued constraint feature; thanks to Dmitrey Kroshko of OpenOpt for the suggestion.
COBYLAnow accepts equality constraints.
- Guard against multiple inclusion in nlopt.hpp; thanks to Saul Thurrowgood for the suggestion.
17 June 2010
- Fixed compilation failure in Microsoft Visual Studio, due to incorrect usage of
__stdcallkeyword; thanks to Dave Katz for the bug report.
16 June 2010
- Bug fix in Fortran API (for
nlo_get_functions returning arrays).
- Fixed buggy compilation with MinGW.
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.)
nlopt.hppwrapper around C API, allowing namespaces, object constructors/destructors,
, and exceptions to be exploited.
- New nlopt wrappers callable from Python and GNU Guile, generated with the help of SWIG.
nloptmanual page documenting new API.
AUGLAGalgorithm(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
- Support inequality constraints directly in
ORIG_DIRECTalgorithms (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
COBYLAalgorithm, 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.
COBYLAto 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.
nlopt_force_stopfunction to force a (graceful) halt to the optimization, and corresponding
- 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-cxxmode; 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.hfile, simplifying Windows compilation.
18 November 2009
- Added Powell's BOBYQA algorithm for box-constrained optimization without derivatives, an improvement on NEWUOA.
- Added ISRES evolutionary algorithm, supporting nonlinearly constrained global optimization.
- New functions
_stochastic_populationto 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.fFortran include file.
- Bug fix: configure script now correctly handles Matlab installation when
MEX_INSTALL_DIRis specified manually by the user.
12 November 2009
configurescript detects whether
--enable-sharedis required in order to compile Matlab and Octave plugins (as is the case on x86_64), and disables compilation of those plugins if
--enable-sharedis not used.
--without-matlabconfigure options to disable Octave and Matlab plugins, respectively.
- Modified COBYLA algorithm to have better support for bound constraints.
- Added new
NLOPT_ROUNDOFF_LIMITEDfailure 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
nlopt.hafter 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_rfunctions 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.
13 November 2008
- Allow user to override Matlab-plugin installation directory with
- 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.
11 November 2008
- Initial public release.