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Show basis functions

Source: R/AllGeneric.R, R/plottingfns.R
show_basis.Rd

Generic plotting function for visualising the basis functions.

Usage

show_basis(basis, ...)

# S4 method for Basis
show_basis(basis, g = ggplot() + theme_bw() + xlab("") + ylab(""))

# S4 method for TensorP_Basis
show_basis(basis, g = ggplot())

Arguments

basis

object of class Basis

...

not in use

g

object of class gg (a ggplot object) over which to overlay the basis functions (optional)

Details

The function show_basis adapts its behaviour to the manifold being used. With real_line, the 1D basis functions are plotted with colour distinguishing between the different resolutions. With plane, only local basis functions are supported (at present). Each basis function is shown as a circle with diameter equal to the scale parameter of the function. Linetype distinguishes the resolution. With sphere, the centres of the basis functions are shown as circles, with larger sizes corresponding to coarser resolutions. Space-time basis functions of subclass TensorP_Basis are visualised by showing the spatial basis functions and the temporal basis functions in two separate plots.

See also

auto_basis for automatically constructing basis functions.

Examples

library(ggplot2)
library(sp)
data(meuse)
coordinates(meuse) = ~x+y # change into an sp object
G <- auto_basis(manifold = plane(),data=meuse,nres = 2,regular=2,prune=0.1,type = "bisquare")
#> NOTE: Zero process variability is implicitly enforced in regions where basis functions are pruned. Please use the option prune carefully: regions of data paucity are generally not reflective of regions of low process variability. Please set prune = 0 if unsure what to do.
if (FALSE) show_basis(G,ggplot()) + geom_point(data=data.frame(meuse),aes(x,y))