柱狀圖的總和不等於一個與normed = True

我剛剛進入柱狀圖繪製，我似乎無法得到norm = True生成此數據集最多爲1的bin。柱狀圖的總和不等於一個與normed = True

import matplotlib.pyplot as plt 

data2B = [ 
    59, 449, 209, 405, 207, 304, 632, 492, 422, 55, 
    49, 527, 401, 633, 115, 73, 241, 240, 379, 363, 
    65, 126, 386, 100, 117, 100, 244, 69, 278, 423, 
    247, 326, 301, 333, 403, 179, 360, 501, 169, 21, 
    388, 428, 325, 127, 42, 387, 163, 153, 291, 707, 
    290, 454, 226, 322, 503, 276, 58, 114, 440, 495, 
    307, 180, 349, 227, 176, 338, 212, 166, 177, 534, 
    330, 281, 286, 136, 601, 179, 307, 296, 250, 598, 
    62, 326, 190, 226, 217, 242, 201, 292, 316, 216, 
    419, 905, 150, 362, 150, 329, 499, 401, 75, 168, 
    355, 116, 54, 227, 476, 158, 332, 162, 110, 269, 
    116, 171, 212, 188, 302, 92, 234, 376, 174, 208, 
    508, 303, 151, 284, 404, 181, 327, 148, 435, 284, 
    233, 160, 163, 441, 219, 556, 396, 224, 119, 293, 
    669, 213, 328, 89, 227, 720, 179, 690, 309, 517, 
    241, 582, 317, 87, 207, 288, 138, 379, 381, 220, 
    351, 150, 56, 107, 357, 239, 565, 486, 278, 127, 
    209, 206, 542, 97, 243, 176, 190, 155, 379, 364, 
    581, 330, 421, 283, 330, 232, 354, 293, 305, 363, 
    256, 237, 381, 156, 272, 356, 643, 572, 159, 217] 

# Plot histogram of data2B 
entries, bin_edges, c = plt.hist(data2B, normed = True) 
plt.title("data2B") 
plt.ylabel("Frequency") 
plt.xlabel("Data Numbers") 

plt.show() 
print sum(entries)

箱的總和出來到0.0113122171946。我究竟做錯了什麼？

Here's the output plot

來源

2016-03-07 ifrancium

箱櫃都加起來1，如果你不要忘了顧及寬度箱

import numpy as np 

entries, bin_edges, c = plt.hist(data2B, normed=True) 

# width of the bins 
print(np.diff(bin_edges)) #[88.4 88.4 ...] 

# integral of the histogram 
print(sum(entries * np.diff(bin_edges))) # 1.0

來源

2016-03-07 16:21:27 Mel

柱狀圖的總和不等於一個與normed = True

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