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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))