library for nonlinear optimization, wrapping many algorithms for global and local, constrained or unconstrained, optimization
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NLopt is a library for nonlinear local and global optimization, for functions with and without gradient information. It is designed as a simple, unified interface and packaging of several free/open-source nonlinear optimization libraries.

The latest release and a complete manual may be found at the NLopt home page:

NLopt is compiled and installed with the CMake build system (see CMakeLists.txt file for available options):

git clone git://
cd nlopt
mkdir build
cd build
cmake ..
sudo make install

(To build the latest development sources from git, you will need SWIG to generate the Python and Guile bindings.)

Once it is installed, #include <nlopt.h> in your C/C++ programs and link it with -lnlopt -lm. You may need to use a C++ compiler to link in order to include the C++ libraries (which are used internally by NLopt, even though it exports a C API).

The minimization function, nlopt_minimize, is described in the manpage (api/nlopt_minimize.3, which is installed by make install). See also the manual on our web page.

There are also interfaces for Fortran, Python, MATLAB, GNU Octave, OCaml, GNU Guile, GNU R, Lua, and Julia. Interfaces for other languages may be added in the future.