Evaluates a function on a surface

Usage

predict.surface(out, grid.list=NA, extrap=F, chull.mask)

Arguments

out An object from fitting a function to data.
grid.list A list with as many components as variables describing the surface. All components should have a single value except the two that give the grid points for evaluation. If the matrix or data frame has column names, these must appear in the grid list.
chull.mask To evaluate on a convex hull, NA's are assigned to outside the convex hull of the data
extrap Extraplolation beyond the range of the data.

Value

The usual list components for making contour and perspective plots along with the component containing the grid list.

See Also

tps, krig, nnreg, predict, persp, contour, interp, grid.list

Examples

tps( BD[,1:4], BD$lnya)-> fit  # fit surface to data
list( KCl="x", MgCl2=mean(BD[,2]),KPO4="y", dNTP=mean(BD[,4]))-> grid
# make grid 
predict.surface(fit,grid) -> out.p  # evalute on a grid on two
# variables holding two fixed 
surface(out.p) # surface and contour plot 


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