更改 matplotlib 中多个子图的 y 轴

Question

我对 python 和 matplotlib 还很陌生。我有以下问题：

我想绘制 2000 年来的六个气候驱动因素。由于每个图代表不同的驱动程序，我想给每个 y 轴一个不同的标签，但无法为每个子图编制索引。请看下面的代码和后续的错误信息：

###Plot MET drivers
fig3 = plt.figure(figsize=(20, 14))

for ii, name_MET in enumerate (["Day_since_start_of_sim", "Min._Temp", "Max._Temp", "Radiation","CO2_(ppm)","DOY"]):
        ax3 = fig3.add_subplot(2,3,ii+1)
        ax3.plot(drivers,'g-',label='2001')
        ax3.set_title(name_MET)
        ax3.set_xlabel('years')
        ax3[1].set_ylabel('Day_since_start_of_simulation')
        ax3[2].set_ylabel('Degrees C')
        ax3[3].set_ylabel('Degrees C')
        ax3[4].set_ylabel('MJ m-2 d-1')
        ax3[5].set_ylabel('ppm')
        ax3[6].set_ylabel('Days')
        ax3.set_xticks(incr_plot_years)
        ax3.set_xticklabels((incr_plot_years/365).astype('S'), rotation = 45)
        ax3.set_xlim(0,ax3.get_xlim()[1])
        ax3.set_ylim(0,ax3.get_ylim()[1])

错误信息：

    287     ax3.set_title(name_MET)
    288     ax3.set_xlabel('years')
--> 289     ax3[1].set_ylabel('Day_since_start_of_simulation')
    290     ax3[2].set_ylabel('Degrees C')
    291     ax3[3].set_ylabel('Degrees C')

TypeError: 'AxesSubplot' object does not support indexing

谁能帮助我如何分别命名每个 y 轴？这对我有很大帮助！

谢谢，

Answer 1

您正在尝试索引 ax3，但 ax3 代表一个子图，而不是整个图。相反，您应该在其相应的循环迭代上标记每个 y 轴。试试这个：

names_MET = ["Day_since_start_of_sim", "Min._Temp", "Max._Temp", "Radiation","CO2_(ppm)","DOY"]
ylabels = ['Day_since_start_of_simulation', 'Degrees C', 'Degrees C', 'MJ m-2 d-1', 'ppm', 'Days']

for ii, (name_MET, ylabel) in enumerate(zip(names_MET, ylabels)):
    ax3 = fig3.add_subplot(2,3,ii+1)
    ax3.plot(drivers,'g-',label='2001')
    ax3.set_title(name_MET)
    ax3.set_xlabel('years')
    ax3.set_ylabel(ylabel)
    ax3.set_xticks(incr_plot_years)
    ax3.set_xticklabels((incr_plot_years/365).astype('S'), rotation = 45)
    ax3.set_xlim(0,ax3.get_xlim()[1])
    ax3.set_ylim(0,ax3.get_ylim()[1])

这里的重要好处是您可以为 y 轴提供自定义标签，而不必使用您在 names_MET 中定义的值。例如，单位 'Degrees C' 而不是简单的 'Min._Temp'.

Answer 2

您似乎枚举了轴上想要的名称列表，因此您可以在每次迭代中使用当前名称，如下所示：

fig3 = plt.figure(figsize=(20, 14))

names =["Day_since_start_of_sim", "Min._Temp", "Max._Temp", 
        "Radiation","CO2_(ppm)","DAY"]

for ii, name_MET in enumerate (names):
    ax3 = fig3.add_subplot(2,3,ii+1)
    ax3.plot(drivers[ii],'g-',label='2001')# - unclear what drivers is?
    ax3.set_title(name_MET)
    ax3.set_xlabel('years')
    ax3.set_ylabel(name_MET)
    ax3.set_xticks(incr_plot_years) # - unclear
    ax3.set_xticklabels((incr_plot_years/365).astype('S'), rotation = 45)
    ax3.set_xlim(0,ax3.get_xlim()[1])
    ax3.set_ylim(0,ax3.get_ylim()[1])

更改 matplotlib 中多个子图的 y 轴

Changing y axis on multiple subplots in matplotlib

python

plot

axes

matplotlib