profile_rotation: Test rotation invariance of index functions for selected 2-d...

In spinebil: Investigating New Projection Pursuit Index Functions

Test rotation invariance of index functions for selected 2-d data set.

Description

Ideally a projection pursuit index should be roation invariant, we test this explicitly by profiling the index while rotating a distribution.

Usage

profile_rotation(d, index_list, index_labels, n = 200)

Arguments

d	data (2 column matrix containing distribution to be rotated)
index_list	list of index functions to calculate for each entry
index_labels	labels used in the output
n	number of steps in the rotation (default = 200)

Value

index values for each rotation step

Examples

d <- as.matrix(sin_data(30, 2))
index_list <- list(tourr::holes(), scag_index("stringy"), mine_indexE("MIC"))
index_labels <- c("holes", "stringy", "mic")
pRot <- profile_rotation(d, index_list, index_labels, n = 50)
plot_rotation(pRot)

spinebil documentation built on Nov. 5, 2025, 7:35 p.m.