NLopt is a library for nonlinear local and global optimization, for functions with and without gradient information. It is designed as as 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: http://ab-initio.mit.edu/nlopt It is compiled and installed with the standard GNU autoconf/automake commands: ./configure make make install See `./configure --help` or the `INSTALL` file for other options. To build the latest development sources: git clone git://github.com/stevengj/nlopt cd nlopt sh autogen.sh make (To build from git, you will need GNU autoconf, automake, and libtool installed, along with SWIG and Unix tools such as m4, perl, and sed.) Once it is installed, `#include <nlopt.h>` in your C/C++ programs and link it with `-lnlopt -lm`. You may need to use the C++ compiler to link in order to include the C++ libraries (which are used internally by NLopt, even though it has a C API). The minimization function, `nlopt_minimize`, is described in the [man page](http://en.wikipedia.org/wiki/Man_page) (`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, Octave, OCaml, GNU Guile, GNU R, Lua, and Julia. Interfaces for other languages may be added in the future.