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Random selection from list


tulach
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I need to select Node from NodeList, but based on random. All nodes should have equall probability of beeing selected.


Does anybody know if this is possible?


I made a workaround with assigning each node a number from 1 to N and then first generate the random number and then search for appropriate Node using SearchStep, but this requires for setting numbers for each node manually and I have a lot of nodes in my model.


Is there a way to use a rank of node in the node list?


Thanks for help.


Petr

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The easiest way is to select it when you actually use it. On the TransferNode use a Selection Goal of Random. Or in a Process use the Route step.


You could also list your nodes in a table instead of a list and randomly select the row of that table.

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Thanks for immediate reply David, I just find the route step option myself, but it is good to know that there is no other elegant option. :-)


But as I want to transfer some entity to the node from node list not using a path, I use this construction.


Route -> Assign (NodeState:=Model.Entity.DestinationNode) -> Transfer (to node: NodeState)


I would be nice if we can just pick a random node form list with something like this


List.MyListName.random


Something we can do with populations.

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Here is a note from one of our developers:

 

I think if you used a Search step like this:


Collection Type: NodeList


Node List Name: The name of the node list to be searched


Search Type: MaximizeExpression


Search Expression: Random.Uniform(0,1)


Then that search will essentially select a node 'randomly' from the searched list. Then store the node found by the Search step into a state variable.


That is basically what the Route step with 'Random' Selection Goal does.

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