CalcJSDivergence {textmineR}

Calculate Jensen-Shannon Divergence

Description

This function calculates the Jensen Shannon Divergence for the rows or columns of a numeric matrix or for two numeric vectors.

Usage

CalcJSDivergence(x, y = NULL, by_rows = TRUE)

Arguments

x

A numeric matrix or numeric vector

y

A numeric vector. y must be specified if x is a numeric vector.

by_rows

Logical. If x is a matrix, should distances be calculated by rows?

Value

If x is a matrix, this returns an square and symmetric matrix. The i,j entries correspond to the Hellinger Distance between the rows of x (or the columns of x if by_rows = FALSE). If x and y are vectors, this returns a numeric scalar whose value is the Hellinger Distance between x and y.

Examples

x <- rchisq(n = 100, df = 8)
y <- x^2
CalcJSDivergence(x = x, y = y)

mymat <- rbind(x, y)
CalcJSDivergence(x = mymat)