lp_distance {flintyR}

Fast l_p^p Distance Vector Computation

Description

Takes in a double matrix \mathbf{X}, whose transpose \mathbf{X}^T has N rows, and computes a vector recording all {N \choose 2} pairwise l_p^p distances of \mathbf{X}^T, ordered lexicographically.

Usage

lp_distance(X, p)

Arguments

X

double matrix (arma::mat class)

p

numeric Minkowski power (double class)

Value

vector of l_p^p distances (arma::vec class)

Examples

# X = [[0.5,0.5],[0,1],[0.3,0.7]] --> lPVec = [x,y,z]
# with x = (0.5^p + 0.5^p)