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How do I declare a global matrix in NETLOGO? (Using matrix extension)

I found an example using the following sintax:

let A matrix: from-row-list [[3 5] [0 1]]
let B matrix: from-row-list [[3 0] [5 1]]

But it keeps showing: Expected keyword. It selects the let reserved word. Thanks.

Solution

  • let defines a variable that's local to a procedure or other embedded context, and it generates that error if used at the top level. I guess that let doesn't count as a "keyword" in that context.

    To define a global matrix, specify the variable name in globals, and then set it inside a procedure:

    extensions [matrix]

globals [A B]

to setup
  set A matrix:from-row-list [[3 5] [0 1]]
  set B matrix:from-row-list [[3 0] [5 1]]
end

    Then add a button that calls setup. Note that you need to remove the space after "matrix:"