===玫瑰图/极地坐标直方图===

[[https://matplotlib.org/stable/gallery/pie_and_polar_charts/polar_bar.html#sphx-glr-gallery-pie-and-polar-charts-polar-bar-py]]

{{:个性化条目:polar_x202sc21071506-z01-f006.png?400|}}

<code>
#-*- coding:utf-8 -*-

import numpy as np
import matplotlib.pyplot as plt

list_all = open("polar_list").readlines()

count = {}

for each in list_all:
    period = int(each.strip())
    if period not in count.keys():
        count_num = 0
        count[period] = count_num
    elif period in count.keys():
        count_num = count[period] + 1
        count[period] = count_num


# 绘制极坐标图
#theta = [0,2,4,6,8,10,12,14,16,18,20,22,24,26]
theta = np.linspace(2*np.pi, 0, 14, endpoint=False)
radii = count.values()

width=-0.5

ax = plt.subplot(111,projection='polar')

plt.thetagrids(np.linspace(360, 0, 14, endpoint=False), [0,2,4,6,8,10,12,14,16,18,20,22,24,26])
ax.set_theta_zero_location('N')
bars = ax.bar(theta,radii,width=width,bottom=0.0,align="center",tick_label=None)
#labels=["","","","","","",""]
#bars = ax.bar(labels,theta,radii,width=width,bottom=0.0,align="center")


# theta指定扇形起始角度位置,radii指定扇形的半径,
# width指定扇形的角度,
# bottom可以指定扇形从是否裁去圆心处的部分



plt.show()
</code>