det.leafs {detpack}

Extract Leaf Elements from Distribution Element Tree

Description

The function det.leafs extracts the distribution elements at the branch ends of a DET generated by the function det.construct.

Usage

det.leafs(det)

Arguments

det

distribution element tree object resulting from det.construct.

Value

A list of vectors containing the leaf element data is returned: p probability density, theta element parameters, lb lower bound, size of element, div divisions or splits along dimensions leading to final element.

Examples

require(stats); require(graphics)
# generate DET based on bi-variate Gaussian data
n <- 1e4; x <- rnorm(n)
x <- matrix(c(x, x+rnorm(n,0,0.2)), nrow = 2, byrow = TRUE)
det <- det.construct(x)
# plot data and element pattern
leafs <- det.leafs(det)
plot(t(x), type = "p", pch = ".", asp = 1)
for (k in 1:length(leafs$p)) {
   p <- leafs$lb[,k] # element corner point
   w <- leafs$size[,k] # element size
   elem <- rbind(c(p[1],p[1]+w[1],p[1]+w[1],p[1],p[1]),
                 c(p[2],p[2],p[2]+w[2],p[2]+w[2],p[2])) # element rectangle
   elem <- t(det$A) %*% elem + det$mu %*% t(rep(1,5)) # pre-white transform
   lines(elem[1,],elem[2,]) # draw element
}