Report an empty patch agentset.
noPatches()Matrix (ncol = 2, nrow = 0) with the first column pxcor and the
second column pycor.
Wilensky, U. 1999. NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern University. Evanston, IL.
p1 <- noPatches()
NLcount(p1)
#> [1] 0