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Construct a new UserDistance. Any two instances of an UserDistance are equal if their string descriptors are equal.

Source: R/metrics.R
user_distance.Rd

Required features: honest-but-curious

Usage

user_distance(descriptor)

Arguments

descriptor

A string description of the metric.

Value

Metric

Details

Why honest-but-curious?:

Your definition of d must satisfy the requirements of a pseudo-metric:

  1. for any \(x\), \(d(x, x) = 0\)

  2. for any \(x, y\), \(d(x, y) \ge 0\) (non-negativity)

  3. for any \(x, y\), \(d(x, y) = d(y, x)\) (symmetry)

  4. for any \(x, y, z\), \(d(x, z) \le d(x, y) + d(y, z)\) (triangle inequality)