Fig. 4

The Trader’s operators. a An example of the retailing operator: three points have been chosen randomly, and, then, their values have been updated by Eq. (9). This operator is only applied to slave_CSs. b An instance of the distributing operator: The master_CS selects two values from its values and distributes them to the slave_CS. c An example of the importing-exporting operator: The exporter CSs select some of their values and send them to the importer CS. After applying the operators, the score function is called. The changes can be accepted, provided that the new score is better than the previous one. In contrast, the changes will be ignored, if the previous values are retrieved from the memory