If no parameters value are provided, default values are:
minPxcor = -16,
maxPxcor = 16, minPycor = -16, and maxPycor = 16.
See help("worldMatrix-class") for more details on the worldMatrix class.
References
Wilensky, U. 1999. NetLogo. http://ccl.northwestern.edu/netlogo/.
Center for Connected Learning and Computer-Based Modeling,
Northwestern University. Evanston, IL.