Class: DbClustering::DistanceMetrics::AverageDifference
- Inherits:
-
Object
- Object
- DbClustering::DistanceMetrics::AverageDifference
- Includes:
- Math
- Defined in:
- lib/distance_metrics/average_difference.rb
Instance Method Summary collapse
- #distance(vector1, vector2) ⇒ Object
-
#initialize(min_dimensions: 1) ⇒ AverageDifference
constructor
A new instance of AverageDifference.
Constructor Details
#initialize(min_dimensions: 1) ⇒ AverageDifference
Returns a new instance of AverageDifference.
6 7 8 |
# File 'lib/distance_metrics/average_difference.rb', line 6 def initialize(min_dimensions: 1) @min_dimensions = min_dimensions end |
Instance Method Details
#distance(vector1, vector2) ⇒ Object
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 |
# File 'lib/distance_metrics/average_difference.rb', line 10 def distance(vector1, vector2) vector1_array = vector1.array_for_comparison(vector2) vector2_array = vector2.array_for_comparison(vector1) if vector1_array.count != vector2_array.count raise "Vectors with different sizes cannot be compared" end if vector1_array.count < @min_dimensions return Float::INFINITY end sum = vector1_array.map.with_index{ |x, i| (x - vector2_array[i]).abs }.reduce(&:+) sum / vector1_array.count.to_f end |