asa047, a FORTRAN77 code which seeks to minimize a scalar function of several variables using the Nelder-Mead algorithm, by R ONeill.
This is Applied Statistics Algorithm 47.
The computer code and data files described and made available on this web page are distributed under the MIT license
asa047 is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
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Original FORTRAN77 version by R ONeill; This FORTRAN77 version by John Burkardt.
You can go up one level to the FORTRAN77 source codes.