我有一个条形图,显示2015年的一个条形图和2016年的一个条形图。
我想在条形图上显示注释,以便更明确规定的数字。我尝试过以下但没有任何反应?
有谁知道我哪里出错了?
这是我的代码
for p in ax.patches:
ax.annotate(str(p.get_height()), (p.get_x() * 1.005, p.get_height() * 1.005))
fig = plt.figure() # Create matplotlib figure
ax = fig.add_subplot(111) # Create matplotlib axes
width = 0.4
df.Occurance_x.plot(kind='bar', color='purple', ax=ax, width=width, position=1)
df.Occurance_y.plot(kind='bar', color='blue', ax=ax, width=width, position=0)
ax.set_ylabel('Amount Prescribed in 1 year')
x_labels = df.VTM_NM
ax.set_xticklabels(x_labels, rotation=30)
plt.legend(['2016', '2017'], loc='upper right')
ax.set_title('BNF Chapter 1 Top 5 drugs prescribed')
plt.show()
答案 0 :(得分:1)
尝试将前两行移至plt.show()
之前。当前代码在定义之前引用ax
。
答案 1 :(得分:1)
你认为这有助于:
import pandas as pd
df = pd.DataFrame({"date_x":[2015]*5,
"Occurance_x":[2994, 2543, 2307, 1535, 1511],
"VTM_NM":["Not Specified", "Mesalazine", "Omeprazole",
"Esomeprazole", "Lansoprazole"],
"date_y":[2016]*5,
"Occurance_y":[3212, 2397, 2370, 1516, 1547]})
ax = df[["VTM_NM","Occurance_x", "Occurance_y"]].plot(x='VTM_NM',
kind='bar',
color=["g","b"],
rot=45)
ax.legend(["2015", "2016"]);
for patch in ax.patches:
bl = patch.get_xy()
x = 0.5 * patch.get_width() + bl[0]
# change 0.92 to move the text up and down
y = 0.92 * patch.get_height() + bl[1]
ax.text(x,y,"%d" %(patch.get_height()),
ha='center', rotation='vertical', weight = 'bold')
修改强>
如果您想要更好的风格,可以在开头添加
from matplotlib import pyplot as plt
plt.style.use('fivethirtyeight')
并使用ax.legend(["2015", "2016"])
修改ax.legend(["2015", "2016"], frameon=False)
。有关样式类型plt.style.available