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DOC: add offset axes to secondary_axes #17324

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May 4, 2020
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DOC: add offset axes to secondary_axes #17324

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DOC: add offset axes to secondary_axes
jklymak May 4, 2020
392e3da
Update examples/subplots_axes_and_figures/secondary_axis.py
jklymak May 4, 2020
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22 changes: 19 additions & 3 deletions examples/subplots_axes_and_figures/secondary_axis.py
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Original file line number Diff line number Diff line change
Expand Up @@ -106,12 +106,13 @@ def inverse(x):

###########################################################################
# A final example translates np.datetime64 to yearday on the x axis and
# from Celsius to Fahrenheit on the y axis:

# from Celsius to Fahrenheit on the y axis. Note the addition of a
# third y axis, and that it can be placed using a float for the
# location argument

dates = [datetime.datetime(2018, 1, 1) + datetime.timedelta(hours=k * 6)
for k in range(240)]
temperature = np.random.randn(len(dates))
temperature = np.random.randn(len(dates)) * 4 + 6.7
fig, ax = plt.subplots(constrained_layout=True)

ax.plot(dates, temperature)
Expand Down Expand Up @@ -147,6 +148,21 @@ def fahrenheit_to_celsius(x):
'right', functions=(celsius_to_fahrenheit, fahrenheit_to_celsius))
secax_y.set_ylabel(r'$T\ [^oF]$')


def celsius_to_anomaly(x):
return (x - np.mean(temperature))


def anomaly_to_celsius(x):
return (x + np.mean(temperature))


# use of a float for the position:
secax_y2 = ax.secondary_yaxis(
1.2, functions=(celsius_to_anomaly, anomaly_to_celsius))
secax_y2.set_ylabel(r'$T - \overline{T}\ [^oC]$')


plt.show()

#############################################################################
Expand Down