netlogo - count the number of occurrences of each item in a list -

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i have list 20 items , want count number of occurrences of each item in list.i know code below

to-report frequency [i lst] report length filter [? = i] list end

but not want write 20 lines like

let c1 frequency 1 (list1) let c2 frequency 2 (list1) . . . let c20 frequency 20 (list1)

that's:

map [frequency ? list1] n-values 20 [? + 1]

sample run:

observer> set list1 [1 4 4 7 10 10 10 14] observer> show map [frequency ? list1] n-values 20 [? + 1] observer: [1 0 0 2 0 0 1 0 0 3 0 0 0 1 0 0 0 0 0 0]

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