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ChemguyLenny
ChemguyLenny

Reputation: 11

Need to do calculations on turtle counts of 4 breeds in Netlogo

I am setting up an equilibrium simulation for a chemical reaction A + B <---> C + D and want to do a calculation of CD/AB (number of turtles) after each tick and add that value to a variable and divide that by the number of ticks run to get an average and then plot that running average. I am able to do the calculation using the Monitor button on the interface screen but would like to plot and average value vs a static value. How do you perform a calculation in Netlogo and store the value?

Upvotes: 1

Views: 43

Answers (1)

JenB
JenB

Reputation: 17678

As soon as you want memory (that is, access to previous values of something), then the easiest way is to use a variable to store the values. You can store the whole series as a list. Let's call the variable 'equilibrium'.

At the top of your code you need:

globals [equilibrium]

to tell NetLogo that the variable exists. Somewhere in your setup you should let NetLogo know this is going to be a list, using:

set equilibrium []

Then when you calculate you can store the current value at the front of the list with something like this (or lput if you want it at the end):

let calc count C * count D / (count A * count B)
set equilibrium fput  calc equilibrium

The average can be found with mean, as for any list. The advantage of having it at the front of the list is that it is always item 0 for the plot.

In this particular case, since you just want the average you don't need the whole list. You could simply create a variable for the total (say cum-calc) and add the current value each tick:

set cum-calc cum-calc + calc

Upvotes: 2

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