n 
Integer. 
world 
WorldMatrix or worldArray object.

torus 
Logical to determine if the world is wrapped. Default is
torus = FALSE . 
minPxcor 
Integer. Minimum pxcor for the patches (world 's left border). 
maxPxcor 
Integer. Maximum pxcor for the patches (world 's right border). 
minPycor 
Integer. Minimum pycor for the patches (world 's bottom border). 
maxPycor 
Integer. Maximum pycor for the patches (world 's top border). 
pxcor 
Integer. Vector of patches pxcor coordinates. Must be of length 1
or of the same length as pycor . 
pycor 
Integer. Vector of patches pycor coordinates. Must be of length 1
or of the same length as pxcor . 
cellNum 
Integer. Vector of cells number. 
pVar 
Character. If the world is a worldArray object, pVar
is the name of the layer to use to define the patches values.
pVar must not be provided if the world is a worldMatrix object. 
turtles 
AgentMatrix object representing the moving agents .

patches 
Matrix (ncol = 2) with the first column pxcor and the second
column pycor representing the patches coordinates. 
agents 
Matrix (ncol = 2) with the first column pxcor and the second
column pycor representing the patches coordinates, or
AgentMatrix object representing the moving agents .

agents2 
Matrix (ncol = 2) with the first column pxcor and the second
column pycor representing the patches coordinates, or
AgentMatrix object representing the moving agents , or
Matrix (ncol = 2) with the first column x and the second column
y representing locations coordinates. 
nNeighbors 
Integer: 4 or 8. Represents the number of neighbor patches
considered. 
dx 
Numeric. Vector of distances to the east (right) from the agents .
If dx is negative, the distance to the west (left) is computed.
dx must be of length 1 or of the same length as number of patches
or turtles in agents . 
dy 
Numeric. Vector of distances to the north (up) from the agents .
If dy is negative, the distance to the south is computed (down).
dy must be of length 1 or of the same length as number of patches
or turtles in agents . 
color 
Character. Vector of color names. Must be of length n .
If missing, colors are assigned using the function rainbow(n) . 
who 
Integer. Vector of the who numbers for the selected turtles . 
breed 
Characters. Vector of breed names for the selected turtles .
If missing, there is no distinction based upon breed . 
var 
Character. The name of the selected agents variable.
If agents are patches and the world is a
worldMatrix object, var must not be provided. If
agents are patches and the world is a worldArray
object, var is the name of the layer to use to define the patches
values. If agents are turtles , var is one of
the turtles ' variable and can be equal to xcor ,
ycor , any of the variables created when turtles were created,
as well as any variable created using turtlesOwn() . 
val 
Numeric or character. Vector of any length. 