1. This package is provided as a companion to the papers
  2. Transport policies in polycentric cities, by
  3. Q. David et M. Kilani, 2019.
  4. The package is composed of two executables :
  5. - scbd : fixed frequencies
  6. - f_scbd : endogenous frequencies
  7. The optimization step relies on the packages BOBYQA
  8. and COBYLA written by Pr. Powell (the double precision
  9. versions are used).
  10. The file "scbd.dat" is read for model parameters.
  11. The source code is located in the "src" subdirectory.
  12. The subroutines are separated into several files.
  13. The EQUILIBRIUM subroutine is central since it is the
  14. one where the network equilibrium is computed.
  15. INSTALLATION (unix like systems)
  16. ================================
  17. 0. For a unix-like system (for Windows
  18. the process should be similar)
  19. We assume that gfortran (or an equivalent)
  20. is installed.
  21. 1. Unzip the file ""
  22. 2. Change to the directory root of that uncompressed folder.
  23. 3. Type "make" (gfortran should be installed)
  24. "scbd" and "f_scbd" executables are produced
  25. 4. Edit "scbd.dat" file and save
  26. 5. Type "./scbd"
  27. The output is written to the screen.
  28. Standard redirection can be used to save output
  29. to file.
  30. REMARK
  31. ======
  32. For some parameter values the obtained output may not
  33. be optimal because the trust region search is
  34. not convenient. In case of doubt, it is preferable to
  35. change the values of parameters "RHOBEG" and "RHOEND"
  36. and check for robustness. Too small values may miss the
  37. exploration of the optimal region and values that are
  38. too large are likely to yield instability and non
  39. convergence. The given values should work well
  40. if the values of the model parameters are are not
  41. changed so much.