on.convex.hull {interp} | R Documentation |
Given a triangulation object tri.obj
of n points in the plane, this
subroutine returns a logical vector indicating if the points
(x_i,y_i)
lay on or in the convex hull of tri.obj
.
on.convex.hull(tri.obj, x, y, eps=1E-16) in.convex.hull(tri.obj, x, y, eps=1E-16)
tri.obj |
object of class |
x |
vector of x-coordinates of points to locate |
y |
vector of y-coordinates of points to locate |
eps |
accuracy for checking the condition |
Logical vector.
Albrecht Gebhardt <albrecht.gebhardt@aau.at>, Roger Bivand <roger.bivand@nhh.no>
triSht
, print.triSht
, plot.triSht
,
summary.triSht
, triangles
,
convex.hull
.
# use a part of the quakes data set: data(quakes) quakes.part<-quakes[(quakes[,1]<=-10.78 & quakes[,1]>=-19.4 & quakes[,2]<=182.29 & quakes[,2]>=165.77),] q.tri<-tri.mesh(quakes.part$lon, quakes.part$lat, duplicate="remove") on.convex.hull(q.tri,quakes.part$lon[1:20],quakes.part$lat[1:20]) in.convex.hull(q.tri,quakes.part$lon[1:20],quakes.part$lat[1:20])