Class: Kmeans::HCluster

Inherits:
Object
  • Object
show all
Defined in:
lib/kmeans/hcluster.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ HCluster

Returns a new instance of HCluster.



17
18
19
 
# File 'lib/kmeans/hcluster.rb', line 17

def initialize
  @out = ""
end

Instance Method Details

#hcluster(rows) ⇒ Object 



40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
 
# File 'lib/kmeans/hcluster.rb', line 40

def hcluster(rows)
  distances = Hash.new
  currentclustid = -1

  clust = Array.new
  for i in 0...rows.length
    c = Bicluster.new(rows[i])
    c.id = i
    clust.push(c)
  end

  while clust.length > 1
    lowestpair = [0,1]
    closest = 1 - Pearson.calc(clust[0].vec, clust[1].vec)
    for i in 0...clust.length
      for j in i+1...clust.length
        if !distances.key?([clust[i].id, clust[j].id])
          distances[[clust[i].id, clust[j].id]] = 1 - Pearson.calc(clust[i].vec, clust[j].vec)
        end
        d = distances[[clust[i].id, clust[j].id]]
        if d < closest
          closest = d
          lowestpair = [i,j]
        end
      end
    end

    mergevec = Array.new
    for i in 0...clust[0].vec.length
      m = (clust[lowestpair[0]].vec[i] + clust[lowestpair[1]].vec[i])/2.0
      mergevec.push(m)
    end

    newcluster = Bicluster.new(mergevec, clust[lowestpair[0]], clust[lowestpair[1]], closest, currentclustid)

    currentclustid -= 1
    clust.delete_at(lowestpair[1])
    clust.delete_at(lowestpair[0])
    clust.push(newcluster)
  end

  return clust[0]
end

#printclust(clust, labels = nil, n = 0) ⇒ Object 



21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/kmeans/hcluster.rb', line 21

def printclust(clust, labels=nil, n=0)
  n.times do
     @out << " "
  end
  if clust.id < 0
    @out << "-\n"
  else
    if labels == nil
      @out << clust.id.to_s + "\n"
    else
      @out << labels[clust.id] + "\n"
    end
  end
  printclust(clust.left, labels, n+1) if clust.left != nil
  printclust(clust.right, labels, n+1) if clust.right != nil

  return @out
end