Same as, e.g.,
inside.owin from package spatstat.geom
point.in.polygon from package sp,
i.e., test whether points lie inside or outside a given polygon.
Actually, the method for
"gpc.poly" documented here internally uses
inside.gpc.poly(x, y = NULL, polyregion, mode.checked = FALSE)
numeric vectors of coordinates of the points to be tested.
The coordinates can be supplied in any form accepted by
an object of class
"gpc.poly". It is checked if the points specified
y fall into this polygonal region.
The nodes and edges of (non-hole) polygons are treated as being inside. Points that fall strictly inside holes are treated as being outside of the polygon.
Logical vector whose
ith entry is
TRUE if the corresponding
(x[i],y[i]) is inside