Is there a function similar to "VrpXMLReader.java", but can read in a costMatrix

jsprit
1

Hi, I am very impressed by the fact that VrpXMLReader can read through a xml file which contains info of all services with their properties like: locationid, coord, cap-demand, duration, timewindow. I am wondering is there anything similar that can read in a costMatrix in some file?

And I also checked out this class “FastVehicleRoutingTransportCostsMatrix.java”, which can handle costMatrix input. But here is my use case, I would like to first get the service info through VrpXMLReader, then I want to modify the cost between every pair of service locations using costMatrix(instead of using the distance cost, I want to feed in a more accurate time cost between locations, which took the traffic into consideration). I am can you give me some instructions on how this can be done? (the thing I worry most about is how to map the service locations in XML config file with the service id in costMatrix)

BTW found there is a class “TSPLIB95CostMatrixReader.java” which seems can read a costMatrix file, but there is no example or instructions on the format of the input file, could you let me know if there is any instructions on that?

2

There is no sufficient costMatrixReader yet. Feel free to build one and to contribute :slightly_smiling:. When it comes to mapping services to locations, you can give every location an index in your xml file like this:

<location>
    <id>depotLoc2</id>
    <coord x="100.0" y="100.0"/>
    <index>1</index>
</location>

In your costMatrix file you then need to refer to this index.

Does this answer your question?

4

Hi, Stefan, sorry for my late reply.
1, I basically referred to the "VehicleRoutingTransportCostsMatrix.Builder"
2, I used service id for each service instead of location id.

That solves my problem.
Thanks.