trmat {spatial} | R Documentation |
Evaluate trend surface over a grid.
trmat(obj, xl, xu, yl, yu, n)
obj |
object returned by surf.ls or surf.gls
|
xl |
limits of the rectangle for grid |
xu |
|
yl |
|
yu |
|
n |
use n x n grid within the rectangle
|
list with components x
, y
and z
suitable for contour
and image
.
data(topo, package="MASS") topo.kr <- surf.ls(2, topo) trsurf <- trmat(topo.kr, 0, 6.5, 0, 6.5, 50)