Limit Range on X Axis Scatter Plot Pandas MatplotLib

Question

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:

AttributeError: 'PathCollection' object has no attribute 'set_xlim'

How can the limit be properly set?

Graph without limits

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()

Possible duplicate of How do I change the range of the x-axis with datetimes in MatPlotLib? — Ilya V. Schurov
– Ilya V. Schurov, Commented Dec 21, 2015 at 22:49

Ilya V. Schurov · Accepted Answer · 2015-12-21 21:33:40Z

4

You can create axes and then use 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)

answered Dec 21, 2015 at 21:33

Ilya V. Schurov

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7 Comments

Withoutahold Over a year ago

@IIya V. Schurov What does the 111 mean?

Ilya V. Schurov Over a year ago

It creates a "subfigure matrix" with 1 row and 1 column. See details here: stackoverflow.com/questions/3584805/…

Withoutahold Over a year ago

@IIya V. Schurov I get "KeyError:time"

Withoutahold Over a year ago

Using the command: df1.plot(x='time',y='number_of_pedestrians_injured', kind='scatter')

Ilya V. Schurov Over a year ago

You can still use plt.scatter instead of df1.plot as you do. For example, you can try plt.xlim() instead of fig.set_xlim() in your code.

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Robert Pollak · Accepted Answer · 2020-08-24 11:52:56Z

3

Use plt.xlim(min, max) instead.

answered Aug 24, 2020 at 11:52

Robert Pollak

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