Report the number of patches or turtles inside
NLcount(agents) # S4 method for matrix NLcount(agents)
ncol = 2) with the first column
pxcor and the second
pycor representing the
patches coordinates, or
Wilensky, U. 1999. NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern University. Evanston, IL.