This code is part of the research paper: "Modified parameter-setting-free harmony search (PSFHS) algorithm for optimizing the design of reinforced concrete beams". C++14, Python 3.7 and Matlab codes for the modified PSFHS algorithm. Those files are placed to reproduce the results, replication of results, of the benchmark function presented in the research paper (Appendix B). The files presented here are not perfect in the programmatic sense. The authors focused on the readability of the files more than the efficiency of the presented codes. The complete source code, reinforced concrete beams optimization model, is not provided in this context; they could be subjected to commercial copyrights in the near future. For any further information about the presented work please contact Email: mahmoud.shaqfa@epfl.ch.