Python 错误：索引 8 超出尺寸为 8 的轴 0 的范围

Question

I'm tryng to run this code to generate some graphics but everytime this error appears. parte of my code:

import matplotlib.pyplot as plt
fig, axs = plt.subplots(8, sharex=False, sharey=False,figsize=(15,15))
fig.suptitle('Todas Features para estado Normal ')
for i in data_n.columns:
    axs[i].plot(data_n[i])
    axs[i].set_title('Coluna {} do Dataset'.format(i))

error:

IndexError                                Traceback (most recent call last)
<ipython-input-129-0fef11f34a8c> in <module>
      3 fig.suptitle('Todas Features para estado Normal ')
      4 for i in data_n.columns:
----> 5     axs[i].plot(data_n[i])
      6     axs[i].set_title('Coluna {} do Dataset'.format(i))

IndexError: index 8 is out of bounds for axis 0 with size 8

when i try to change de number os subplots, nothing changes.

Answer 1

It's not clear what your data_n variable is but I'm guessing it's probably a pandas.DataFrame object.

Python for loops are 0-indexed and your IndexError error is occuring at index 8, so data_n.columns is probably an iterable pandas.DataFrame.columns object that has more than 8 values. You can check this with len(data_n.columns) .

Consider trying:

import matplotlib.pyplot as plt
fig, axs = plt.subplots(len(data_n.columns), sharex=False, sharey=False,figsize=(15,15))
fig.suptitle('Todas Features para estado Normal ')
for i in data_n.columns:
    axs[i].plot(data_n[i])
    axs[i].set_title('Coluna {} do Dataset'.format(i))

This will only work if the names of the data_n columns are integers, which they may or may not be. To handle column names such as col1 , col2 , etc. you'll need to use an integer index, as in this basic example:

indexer = 0
for i in data_n.columns:
    axs[indexer].plot(data_n[i])
    axs[indexer].set_title('Coluna {} do Dataset'.format(i))
    indexer += 1