我有以下df
,要从中创建条形图:
import pandas as pd
import matplotlib.pyplot as plt
import numpy as np
df = pd.DataFrame({
'Country': ["A", "B", "C", "D", "E", "F", "G"],
'Answer declined': [0.000000, 0.000000, 0.000000, 0.000667, 0.000833, 0.000833, 0.000000],
"Don't know": [0.003333, 0.000000, 0.000000, 0.001333, 0.001667, 0.000000, 0.000000],
"No": [0.769167, 0.843333, 0.762000, 0.666000, 0.721667, 0.721667, 0.775833],
"Yes": [0.227500, 0.156667, 0.238000, 0.332000, 0.275833, 0.277500, 0.224167]}, )
df.set_index("Country", inplace = True)
由于有多个这样的
df
,因此我创建了一个函数来调用来自不同df
的条形图:def bar_plot(plot_df):
N = len(plot_df) # number of groups
num_y_cats = len(plot_df.columns) # number of y-categories (responses)
ind = np.arange(N) # x locations for the groups
width = 0.35 # width of bars
p_s = []
p_s.append(plt.bar(ind, plot_df.iloc[:,0], width))
for i in range(1,len(plot_df.columns)):
p_s.append(plt.bar(ind, plot_df.iloc[:,i], width,
bottom=np.sum(plot_df.iloc[:,:i], axis=1),
label = 'TEST'))
plt.ylabel('[%]')
plt.title('Responses by country')
x_ticks_names = tuple([item for item in plot_df.index])
plt.xticks(ind, x_ticks_names)
plt.yticks(np.arange(0, 1.1, 0.1)) # ticks from, to, steps
plt.legend(p_s, plot_df.columns,
bbox_to_anchor = (0.5, -0.25),
#bbox_to_anchor = (0., 1.02, 1., .102),
loc = 'lower center',
ncol = num_y_cats // 2,
borderaxespad = 0
)
plt.show()
plt.close() # close the figure
bar_plot(df)
这可行,但我无法解决结果图的一个问题:如果响应(即列名)包含“是”,我希望首先显示(即在底部),否则在结果图中不做任何更改。
到目前为止,我基于this问题的尝试均未成功。
编辑:我找到了一个解决方案,现在正在寻找一个优雅的解决方案。
最佳答案
由于您已经在使用pandas.DataFrame
,为什么不使用便捷方法plot()
:
def bar_plot(plot_df):
N, num_y_cats = plot_df.shape
width = 0.35
cols = plot_df.columns.tolist()
if 'Yes' in cols:
cols.insert(0, cols.pop(cols.index('Yes')))
plot_df[cols].plot(kind='bar',
stacked=True,
width=width,
title='Responses by country'
)
plt.ylabel('[%]')
plt.xlabel('')
plt.xticks(rotation=0)
plt.yticks(np.arange(0, 1.1, 0.1))
plt.legend(loc='lower center',
ncol = num_y_cats // 2,
bbox_to_anchor = (0.5, -0.25),
borderaxespad = 0
)
plt.show()
plt.close() # close the figure
bar_plot(df)
关于python - 功能中的条形图-有条件地更改功能中条形的顺序,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/54998761/