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