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Evaluate Trend Surface over a Grid
Usage
trmat(obj, xl, xu, yl, yu, n)
Arguments
obj
|
object returned by surf.ls or surf.gls
|
xl
|
limits of the rectangle for grid
|
xu
|
|
yl
|
|
yu
|
|
n
|
use n (mu n grid within the rectangle
|
Description
Evaluate trend surface over a grid.
Value
list with components x
, y
and z
suitable for contour
and image
.
See Also
surf.ls
, surf.gls
Examples
data(topo)
topo.kr <- surf.ls(2, topo)
trsurf <- trmat(topo.kr, 0, 6.5, 0, 6.5, 50)
contour(trsurf$x, trsurf$y, trsurf$z, levels=seq(700, 925, 25))