Evaluate trend surface over a grid.
trmat(obj, xl, xu, yl, yu, n)
object returned by surf.ls or surf.gls
surf.ls
surf.gls
limits of the rectangle for grid
use n x n grid within the rectangle
n
list with components x, y and z suitable for contour and image.
x
y
z
contour
image
Ripley, B. D. (1981) Spatial Statistics. Wiley.
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.
surf.ls, surf.gls
# NOT RUN { data(topo, package="MASS") topo.kr <- surf.ls(2, topo) trsurf <- trmat(topo.kr, 0, 6.5, 0, 6.5, 50) # }
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