ValueError: view limit minimum -35738.3640567 is less than 1 and is an invalid Matplotlib date value

  • Set the 'datetime' column to a datetime64[ns] Dtype to resolve the error:
    • Use pandas.to_datetime to convert the 'datetime' column, and remember to assign the column back to itself, because this is not an inplace update.
    • pandas is good at figuring out the format of datetimes, but it may be necessary to use the format= option to specify the current format of the 'datetime' column. See Convert Pandas Column to DateTime.
  • Column names can be accessed with a ., if they do not contain special characters, and do not clash with built-in attributes/methods (e.g., index, count).
    • df_google.datetime instead of df_google['datetime']
import pandas as pd
import matplotlib.pyplot as plt

# given the following data
data = {'datetime': ['2018-05-15', '2018-05-16', '2018-05-17', '2018-05-18', '2018-05-21', '2018-05-22', '2018-05-23', '2018-05-24', '2018-05-25', '2018-05-29'],
        'price': [1079.22998, 1081.77002, 1078.589966, 1066.359985, 1079.579956, 1069.72998, 1079.689941, 1079.23999, 1075.660034, 1060.319946]}

df_google = pd.DataFrame(data)

# convert the datetime column to a datetime type and assign it back to the column
df_google.datetime = pd.to_datetime(df_google.datetime)

# display(df_google.head())
     datetime        price
0  2018-05-15  1079.229980
1  2018-05-16  1081.770020
2  2018-05-17  1078.589966
3  2018-05-18  1066.359985
4  2018-05-21  1079.579956
5  2018-05-22  1069.729980
6  2018-05-23  1079.689941
7  2018-05-24  1079.239990
8  2018-05-25  1075.660034
9  2018-05-29  1060.319946

Verify the 'datetime' column is a datetime64[ns] Dtype:

print(df_google.info())

<class 'pandas.core.frame.DataFrame'>
RangeIndex: 10 entries, 0 to 9
Data columns (total 2 columns):
 #   Column    Non-Null Count  Dtype         
---  ------    --------------  -----         
 0   datetime  10 non-null     datetime64[ns]
 1   price     10 non-null     float64       
dtypes: datetime64[ns](1), float64(1)
memory usage: 288.0 bytes

Plot:

  • Specify the column to be the axis with x=... to plot.
df_google.plot(x='datetime')
plt.show()
  • The column to be the x-axis can also be set as the index with df.set_index('datetime', inplace=True), and then df.plot() to plot, but setting the index is not necessary, and is irrelevant to the error.
  • There’s a substantial ecosystem of alternative plotting tools, but df.plot() is fine for getting a look at the data.

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Note:

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