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Javier Sandoval
Javier Sandoval

Reputation: 507

Netlogo Rnd Extension: loading probability weights through Input boxes

I want a random item reported from this list:

set probability-list [["residential" 0.60] ["commercial" 0.30] ["industrial" 0.10]]

The way they are called is:

set land-use first rnd:weighted-one-of-list probability-list last

But I want the weight of each item to be inputted by the user through input boxes in the model's interface, not in the code itself. For this, I added an input box for each item called Res, Com and Ind. So the code for the list is now:

set probability-list [["residential" Res] ["commercial" Com] ["industrial" Ind]]

but Netlogo highlights code with the weight name and the message "Expected a literal value". Can this be fixed?

Upvotes: 0

Views: 2529

Answers (1)

Jasper
Jasper

Reputation: 2780

When you make a list literal in NetLogo, you can only put other literal items (strings, numbers, booleans) that you type into the code in that list.

To make a "dynamic" list using variables, you have to use the list primitive with parenthesis:

set probability-list (list (list "residential" Res) (list "commercial" Com) (list "industrial" Ind))

This is outlined in the NetLogo programming guide under lists.

Upvotes: 2

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