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Poushan Shrestha
Poushan Shrestha

Reputation: 23

How to add values of a variable for specific turtles?

I want to add the values of a variable ( let's say transportation cost) for specific turtles which are in a group. The transportation cost depends on the distance between a specific patch and the location assigned to the turtle. As the value of the said cost is different for each turtle, I want to sum the total cost for turtle which are in a group. To clarify, let's suppose there are 7 turtles in total and only 4 are in a group.

The values of transportation cost of each turtle is assigned as tcost.

to calculate-ttcost set ttcost 0 let cnt 0 ask turtles [ if in-group? [ set ttcost (tcost + tcost) set cnt cnt + 1 ] ] end

Upvotes: 1

Views: 136

Answers (1)

Charles
Charles

Reputation: 4168

With the correction of one typo, the code you have should work, assuming that tcost is declared as a turtles-own variable with that turtle's transportation cost (or a reporter that gives the transportation cost for the turtle that calls it), and assuming that those turtles that are in the group in which you are interested have their turtles-own variable in-group? set to true. The typo is in the line

set ttcost (tcost + tcost)

which should be

set ttcost (ttcost + tcost)

But there is a more straight-forward coding that will accomplish the same task.

let cnt count turtles with [in-group?]
let ttcost sum [tcost] of turtles with [in-group?]

with limits the set of turtles to those for which in-group is true. of creates a list of the values of tcost for each of those turtles, which can then be summed up.

Upvotes: 3

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