誰能給我一個關于如何在我的情節中添加圖例的提示？我對情節的樣子很滿意，只需要一個圖例:)
# data from pandas df's
zoom_plot = fc1_dataset.loc['2021-8-9'].between_time('5:00', '17:00')
_no_vfd_sig = zoom_plot[['fc1_flag','duct_static','duct_static_setpoint']]
_vfdsig = zoom_plot.vfd_speed
# using subplots() function
fig, ax = plt.subplots(figsize=(25,8))
plt.title('Visually verify FDD is flagging OK')
# using the twinx() for creating another
# axes object for secondary y-Axis
ax2 = ax.twinx()
ax.plot(zoom_plot.index, _no_vfd_sig)
ax2.plot(zoom_plot.index, _vfdsig, color = 'r')
# giving labels to the axises
ax.set_xlabel('Date')
ax.set_ylabel('Duct Pressure and FDD Flag')
# secondary y-axis label
ax2.set_ylabel('% Fan Speed')
# defining display layout
plt.tight_layout()
# show plot
plt.show()
輸出：
uj5u.com熱心網友回復：
和之前的代碼一樣...
plot1, = ax.plot(zoom_plot.index, _no_vfd_sig)
plot2, = ax2.plot(zoom_plot.index, _vfdsig, color = 'r')
ax.set_xlabel('Date')
ax.set_ylabel('Duct Pressure and FDD Flag')
# secondary y-axis label
ax2.set_ylabel('% Fan Speed')
plt.legend([plot1,plot2],["plot 1", "plot 2"])
# defining display layout
plt.tight_layout()
# show plot
plt.show()
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標籤：Python 熊猫 matplotlib
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