Introduction In this tutorial we are going to show you how to model a vehicle routing problem with vehicles that can have multiple return trips to the depot or hub. For example, let us assume you have 2 drivers that have a car much like the one on the figure below. It has an electric […]

Every optimization requires an objective ie. a goal to which the results should be optimize for. Here, we want to illustrate the differences between two objectives: min transport time and min completion time. Using the GraphHopper Directions API the specification of these goals is as simple and intuitive as the following json snippets: or Transport […]

Introduction In this tutorial we are going to show you how to model a vehicle routing problem where tasks do not only have multiple dependencies, but also require special skills. For example, let us assume we have two technicians called Peter and Stefan. Peter cannot only read the warm water meter, but he can also […]

Introduction In this tutorial we are going to show you how to model a traveling salesman problem with a week-planning horizon. For example, let us assume you have ONE worker that needs to visit 25 customers in the course of the next week. Let us also assume that the worker has specific daily working hours […]

In our last blog post we elaborated the problem of finding a route through Dublin without passing by any Pub. Rory gave us the idea for this, and now again, pointed us to an article reporting that recently there was a Japanese man trying to visit each and every pub to drink a pint of […]