Python - subplot only displaying the bottom plot

Question

I have an issue with Python plotting the data set as 'ax1' on the bottom subplot, and not plotting the 'ax2' data anywhere, leaving the top subplot blank.

Any help appreciated!

fig, (ax1, ax2) = plt.subplots(2, sharex=True)
    fig.suptitle('Sea Surface pCO2 (ppmv)')
    ax1 = ax1.plot(interp_bathy.where(interp_bathy > 0).plot(cmap=cm.topo, vmin = -4000, vmax = 4000, add_colorbar=False),interp_pco2_pre.where(interp_bathy >-120).where(interp_bathy <0).plot(levels=np.arange(200,501,10), cmap=cm.thermal, cbar_kwargs = {'label':'Sea surface pCO2 (ppmv)'}))
    ax2 = ax2.plot(interp_bathy.where(interp_bathy > 0).plot(cmap=cm.topo, vmin = -4000, vmax = 4000, add_colorbar=False),interp_pco2_pd.where(interp_bathy >-120).where(interp_bathy <0).plot(levels=np.arange(200,501,10), cmap=cm.thermal, cbar_kwargs = {'label':'Sea surface pCO2 (ppmv)'}))

adch99 · Accepted Answer · 2020-05-09 14:13:46Z

I think you need to understand what ax.plot and pandas.Series.plot do. The way to do this would be to pass the axes to the pandas.Series.plot function. Instead, you are passing the plotted instance to ax.plot itself, which doesn't make sense.

Try doing the following:

data1.plot(otherparams.., ax=ax1)
data2.plot(otherparams.., ax=ax2)

In your case, it would probably be like:

dataset1 = interp_bathy.where(interp_bathy > 0)
dataset2 = interp_pco2_pre.where(interp_bathy > -120).where(interp_bathy < 0)
dataset3 = interp_pco2_pd.where(interp_bathy > -120).where(interp_bathy < 0)

dataset1.plot(cmap=cm.topo, vmin = -4000, vmax = 4000,
    add_colorbar=False, ax=ax1)
dataset2.plot(levels=np.arange(200,501,10), cmap=cm.thermal,
    cbar_kwargs = {'label':'Sea surface pCO2 (ppmv)'}, ax=ax1)
dataset1.plot(cmap=cm.topo, vmin = -4000, vmax = 4000,
    add_colorbar=False, ax=ax2)
dataset3.plot(levels=np.arange(200,501,10), cmap=cm.thermal,
    cbar_kwargs = {'label':'Sea surface pCO2 (ppmv)'}, ax=ax2)

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