Question

I am trying to find if there is a turtle on patch-ahead n

whose speed - acceleration is <= 0. The code I came up with is:

if any? turtles on patch-ahead n with [speed <= (speed - acceleration)]

but this gives an error that:

patch-ahead expects a number, instead got agent set.

How do I remedy this?

n is a number variable. I want to access the turtle s speed , which is a user defined turtle-own variable, at the nth patch from the calling turtle. The command with doesn t work here. Please suggest an alternative to access the speed of the turtle at, say, the 3rd patch from the calling turtle.

Answer 1

If you look at the patch-ahead documentation you will notice that it does require one argument: a number representing the distance to look ahead. You are using a patch n instead of a number.

As per you comment, I think maybe you want turtles-on, and use parenthesis to make it clearer, as such:

if any? ((turtles-on patch-ahead n) with [speed <= (speed - aceleration)])

In the above I am assuming that n is a number: the distance you want to look ahead.

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