Matplotlib using twinx() - TypeError: 'AxesSubplot' object does not support item assignment

Question

I am trying to have a multiple subplots with twinx() for the charts, but met with this error: TypeError: 'AxesSubplot' object does not support item assignment The code is as following:

fig, ax = plt.subplots(4,5,figsize=(8,8))
ax2[0,0]=ax[0,0].twinx()

When I try another way without the arrays:

fig, ax = plt.subplots(4,5,figsize=(8,8))
ax2=ax.twinx()

it comes out with another error:

AttributeError: 'numpy.ndarray' object has no attribute 'twinx'

Quang Hoang · Accepted Answer · 2020-07-24 03:06:49Z

1

Are you trying to create a twinx axis for each subplot? If so, you can do:

fig, ax = plt.subplots(4,5, figsize=(8,8))

ax2 = np.array([a.twinx() for a in ax.ravel()]).reshape_like(ax)

Then ax2 is a 2D-array with the same shape as ax, here 4,5; and each element of ax2 is a twinx instance of the corresponding element of ax.

answered Jul 24, 2020 at 3:06

Quang Hoang

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1 Comment

Eaglepix Over a year ago

Yes, am trying to have twinx for each subplot. Thank you very much! It works, I changed the last part to .reshape(ax.shape)

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