X 轴散点图 Pandas MatplotLib 上的限制范围
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Limit Range on X Axis Scatter Plot Pandas MatplotLib
提问by Withoutahold
I have a dataframe that is indexed based on time, with another column indicating the number of injured pedestrians during a crash occuring at that hour. I am trying to use Matplotlib in order to graph the data, and have successfully graphed it, however, the range is much too large. I have data for one day, and would like to set the x axis limit accordingly using the min and max values calculted. I have tried using plt.set_xlim but I get an error:
我有一个基于时间索引的数据框，另一列表示当时发生撞车事故时受伤行人的数量。我正在尝试使用 Matplotlib 来绘制数据，并成功绘制了它，但是，范围太大了。我有一天的数据，并想使用计算的最小值和最大值相应地设置 x 轴限制。我曾尝试使用 plt.set_xlim 但出现错误：
AttributeError: 'PathCollection' object has no attribute 'set_xlim'
AttributeError: 'PathCollection' 对象没有属性 'set_xlim'
How can the limit be properly set?
如何正确设置限制？
Graph without limits
图表无限制
df = test_request_pandas()
df1 = df[['time','number_of_pedestrians_injured']]
df1.set_index(['time'],inplace=True)
df1 = df1.astype(float)
min = df1.index.min()
max = df1.index.max()
fig = plt.scatter(df1.index.to_pydatetime(), df1['number_of_pedestrians_injured'])
#fig.set_xlim([min, max]) // causing me issues
plt.show()
回答by Ilya V. Schurov
You can create axes and then use ax.xlim().
您可以创建轴，然后使用ax.xlim().
import pandas as pd
df = pd.DataFrame({'x':[1,2,3], 'y':[3,4,5]})
fig = plt.figure()
ax = plt.subplot(111)
df.plot(x='x',y='y',ax=ax, kind='scatter')
ax.set_xlim(2,3)
