ruzicka {abdiv}

Ruzicka or weighted Jaccard distance

Description

Ruzicka or weighted Jaccard distance

Usage

ruzicka(x, y)

Arguments

x, y

Numeric vectors.

Details

For vectors x and y, the Ruzicka distance is defined as

d(x, y) = 1 - \frac{\sum_i \min(x, y)}{\sum_i \max(x, y)}.

Relation to other definitions:

• Equivalent to vegdist() with method = "jaccard".

• Related to the Bray-Curtis distance, d_r = 2 d_{bc} / (1 + d_{bc}).

Value

The Ruzicka distance between x and y. The distance is not defined if all elements in x and y are zero, and we return NaN in this case.