I'm trying to do something slightly that I wouldn't think would be hard, but I can't figure out how to get python/matplotlib/pylab to do.
我正在尝试做一些我认为不会很难的事情，但我无法弄清楚如何让python / matplotlib / pylab来做。
Given an input, I want a histogram that shows me the number of times each element appears.
给定一个输入，我想要一个直方图，显示每个元素出现的次数。
Given a list
给出一个清单
x=range(10)
I'd like output that has a single bar, y value of 10, equal to x=1, no other graphs.
我想要输出具有单个条形，y值为10，等于x = 1，没有其他图形。
given a list
给出一个清单
x=range(10)
x.append(1)
I'd like the output to have two bars, a y value of 9 for x=1, a y value of 1 for x=2. How can I do this?
我希望输出有两个条形，x = 1时y值为9，x = 2时y值为1。我怎样才能做到这一点？
4 个解决方案
#1
8
This code gives you a histogram like the one you like:
此代码为您提供了您喜欢的直方图：
import matplotlib.pyplot as plt
import numpy as np
y = np.array([0,1,2,3,4,5,6,7,8,9,1])
plt.hist(y);
plt.show()
#2
5
Something like this? This code uses a Counter to count the number of instances that an object occurs in an array (in this case counting the number of times an integer is in your list).
像这样的东西？此代码使用Counter来计算对象在数组中出现的实例数（在这种情况下，计算整数在列表中的次数）。
import matplotlib.pyplot as plt
from collections import Counter
# Create your list
x = range(10)
x.append(1)
# Use a Counter to count the number of instances in x
c = Counter(x)
plt.bar(c.keys(), c.values())
plt.show()
#3
1
You'll of course have to start by counting the elements:
你当然必须从计算元素开始：
>>> from collections import Counter
>>> counts = Counter(my_iterator)
Then, we wish to count these counts:
然后，我们希望计算这些计数：
>>> count_von_count = Counter(counts)
Then you've got the size of your bars. Make it into a list and plot it:
那你就得到了酒吧的大小。将其放入列表并绘制它：
>>> bars = [count_von_count[i] for i in range(max(count_von_count) + 1)]
Example for your extended list:
扩展列表的示例：
>>> from collections import Counter
>>> counts = Counter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1])
>>> counts
Counter({1: 2, 0: 1, 2: 1, 3: 1, 4: 1, 5: 1, 6: 1, 7: 1, 8: 1, 9: 1})
>>> count_von_count = Counter(counts.values())
>>> count_von_count
Counter({1: 9, 2: 1})
>>> bars = [count_von_count[i] for i in range(max(count_von_count) + 1)]
>>> bars
[0, 9, 1]
#4
0
If you collect your data into a list of lists, then you might do something like this:
如果您将数据收集到列表列表中，那么您可能会执行以下操作：
import numpy as np
import matplotlib.pyplot as plt
x = [range(10)]
x.append([1])
count = map(len, x)
plt.bar(range(len(count)), count)
plt.show()
Note that the first bar has height 10, not 9. I don't know if that is what you desire or if I'm misunderstanding your intention.
请注意，第一个栏的高度为10，而不是9.我不知道这是你想要的，还是我误解了你的意图。
#1
8
This code gives you a histogram like the one you like:
此代码为您提供了您喜欢的直方图：
import matplotlib.pyplot as plt
import numpy as np
y = np.array([0,1,2,3,4,5,6,7,8,9,1])
plt.hist(y);
plt.show()
#2
5
Something like this? This code uses a Counter to count the number of instances that an object occurs in an array (in this case counting the number of times an integer is in your list).
像这样的东西？此代码使用Counter来计算对象在数组中出现的实例数（在这种情况下，计算整数在列表中的次数）。
import matplotlib.pyplot as plt
from collections import Counter
# Create your list
x = range(10)
x.append(1)
# Use a Counter to count the number of instances in x
c = Counter(x)
plt.bar(c.keys(), c.values())
plt.show()
#3
1
You'll of course have to start by counting the elements:
你当然必须从计算元素开始：
>>> from collections import Counter
>>> counts = Counter(my_iterator)
Then, we wish to count these counts:
然后，我们希望计算这些计数：
>>> count_von_count = Counter(counts)
Then you've got the size of your bars. Make it into a list and plot it:
那你就得到了酒吧的大小。将其放入列表并绘制它：
>>> bars = [count_von_count[i] for i in range(max(count_von_count) + 1)]
Example for your extended list:
扩展列表的示例：
>>> from collections import Counter
>>> counts = Counter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 1])
>>> counts
Counter({1: 2, 0: 1, 2: 1, 3: 1, 4: 1, 5: 1, 6: 1, 7: 1, 8: 1, 9: 1})
>>> count_von_count = Counter(counts.values())
>>> count_von_count
Counter({1: 9, 2: 1})
>>> bars = [count_von_count[i] for i in range(max(count_von_count) + 1)]
>>> bars
[0, 9, 1]
#4
0
If you collect your data into a list of lists, then you might do something like this:
如果您将数据收集到列表列表中，那么您可能会执行以下操作：
import numpy as np
import matplotlib.pyplot as plt
x = [range(10)]
x.append([1])
count = map(len, x)
plt.bar(range(len(count)), count)
plt.show()
Note that the first bar has height 10, not 9. I don't know if that is what you desire or if I'm misunderstanding your intention.
请注意，第一个栏的高度为10，而不是9.我不知道这是你想要的，还是我误解了你的意图。