问题
In order to display a very simple timeline of Ancient History (inspired by Wolfram Alpha timelines), I have slightly modified a small python program found on S.O. (How to draw a bar timeline with matplotlib?) :
import matplotlib.pyplot as plt
import numpy as np
event = np.array(['Antiquity','Egypt','W.R.Empire','E.R.Empire','Writing','C.Colomb','Middle Ages'])
begin = np.array([-3400,-3150,285,330,-3400,1492,476])
end = np.array([476,30,476,1453,-3300,1493,1492])
plt.barh(range(len(begin)), end-begin, left=begin, align='center')
plt.yticks(range(len(begin)), event)
plt.show()
How can I sort (ascending) the timeline by the beginning date ? The reason is that I wish to enter the data as they come (Minoans, Elam, etc...) without having to rearrange the arrays each time, which would be tedious.
This is not homework. I am simply a Python newbie, and I can't figure how to answer my own question…
回答1:
You may want to sort your values.
import matplotlib.pyplot as plt
import numpy as np
event = np.array(['Antiquity','Egypt','W.R.Empire','E.R.Empire','Writing','Middle Ages'])
begin = np.array([-3400,-3150,285,330,-3400,476])
end = np.array([476,30,476,1453,-3300,1493])
beg_sort = np.sort(begin)
end_sort = end[np.argsort(begin)]
evt_sort = event[np.argsort(begin)]
plt.barh(range(len(beg_sort)), end_sort-beg_sort, left=beg_sort, align='center')
plt.yticks(range(len(beg_sort)), evt_sort)
plt.show()
来源：https://stackoverflow.com/questions/48937397/how-to-sort-a-historical-timeline-written-with-python-matplotlib