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Contents
module EverydayCliUtils
class Histogram
def self.setup(collection, height, width)
mi = collection.min
ma = collection.max
diff = ma - mi
step = diff.to_f / (width.to_f - 1)
counts = Array.new(width, 0)
collection.each { |v| counts[((v - mi).to_f / step.to_f).floor] += 1 }
max_y = counts.max
lines = Array.new(height) { ' ' * width }
return counts, lines, max_y, mi, step
end
def self.add_graph(counts, height, lines, max_y, width)
(0...width).each { |i|
h = ((counts[i].to_f / max_y.to_f) * height.to_f).round
((height - h)...height).each { |j|
lines[j][i] = '#'
}
if h == 0 && counts[i] > 0
lines[height - 1][i] = '_'
end
}
end
def self.add_averages(height, ks, lines, mi, step, width)
lines[height] = ' ' * width
ks.each { |v| lines[height][((v - mi) / step).to_i] = '|' }
end
def self.histogram(collection, ks = nil, width = 100, height = 50)
counts, lines, max_y, mi, step = setup(collection, height, width)
add_graph(counts, height, lines, max_y, width)
add_averages(height, ks, lines, mi, step, width) unless ks.nil?
lines
end
end
end
Version data entries
33 entries across 33 versions & 1 rubygems