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Python histogramming
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def histogram(nums, n_buckets, title): | |
min_val = min(*nums) | |
max_val = max(*nums) | |
buckets = [] | |
bucket_width = (max_val - min_val) / float(n_buckets) | |
while (len(buckets) < n_buckets): | |
buckets.append(0) | |
sum_of_values = 0 | |
for num in nums: | |
sum_of_values += num | |
bucket_idx = max(0, min(n_buckets - 1, int((num - min_val) / bucket_width))) | |
buckets[bucket_idx] += 1 | |
bucket_labels = [ | |
'[%.02g, %.02g)' % (min_val + i * bucket_width, min_val + (i + 1) * bucket_width) | |
for i in range(0, n_buckets) | |
] | |
label_column_width = max(*[len(lbl) for lbl in bucket_labels]) | |
histogram_lines = [] | |
n_text_columns = 75 | |
max_count = max(*[buckets]) | |
# Header line like '### TITLE ###' | |
left_pad = (n_text_columns - len(title) - 2) // 2 | |
histogram_lines.append( | |
f'{"#" * left_pad} {title} {"#" * (n_text_columns - len(title) - 2 - left_pad)}' | |
) | |
total = 0 | |
for i in range(0, n_buckets): | |
bucket_label = bucket_labels[i] | |
count = buckets[i] | |
total += count | |
line = ' ' * (label_column_width - len(bucket_label)) | |
line += bucket_label | |
line += ': ' | |
bar_width = (count / max_count) * 45.0 | |
line += '▄' * int(bar_width) | |
if bar_width > int(bar_width): | |
line += '▖' | |
line += ' (%s)' % count | |
histogram_lines.append(line) | |
average = sum_of_values / total | |
histogram_lines.append('Total: %d, mean: %0.2g' % (total, average)) | |
return '\n'.join(histogram_lines) |
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