python - Matplotlib - 值错误 : Illegal argument(s) to subplot

Question

我有 4 个数字 (y1,y2,y3,y4)，我想在公共(public) x 轴 (yr1,yr2,yr3,m1,m2,m3,m4,m5) 上绘制。然而，在这段代码中，我将 axaxis 保持为单独的，因为我试图首先掌握正确的基础知识。

import matplotlib.pyplot as plt
import numpy as np

plt.figure(1)
xaxis = ['y1','y2','y3','m1','m2','m3', 'm4', 'm5']
y1 = np.array([.73,.74,.71,.75,.72,.75,.74,.74])
y2 = np.array([.82,.80,.77,.81,.72,.81,.77,.77])
y3 = np.array([.35,.36,.45,.43,.44,.45,.48,.45])
y4 = np.array([.49,.52,.59,.58,.61,.65,.61,.58])

plt.subplot(221)
plt.plot(xaxis,y1)
plt.subplot(222)
plt.plot(xaxis,y2)
plt.subplot(223)
plt.subplot(xaxis,y3)
plt.subplot(224)
plt.subplot(xaxis,y4)
plt.show()

收到此错误

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-23-dfe04cc8c6c4> in <module>
     14 plt.plot(xaxis,y2)
     15 plt.subplot(223)
---> 16 plt.subplot(xaxis,y3)
     17 plt.subplot(224)
     18 plt.subplot(xaxis,y4)

~\AppData\Local\Continuum\anaconda3\lib\site-packages\matplotlib\pyplot.py in subplot(*args, **kwargs)
   1074 
   1075     fig = gcf()
-> 1076     a = fig.add_subplot(*args, **kwargs)
   1077     bbox = a.bbox
   1078     byebye = []

~\AppData\Local\Continuum\anaconda3\lib\site-packages\matplotlib\figure.py in add_subplot(self, *args, **kwargs)
   1412                     self._axstack.remove(ax)
   1413 
-> 1414             a = subplot_class_factory(projection_class)(self, *args, **kwargs)
   1415 
   1416         return self._add_axes_internal(key, a)

~\AppData\Local\Continuum\anaconda3\lib\site-packages\matplotlib\axes\_subplots.py in __init__(self, fig, *args, **kwargs)
     62                 # num - 1 for converting from MATLAB to python indexing
     63         else:
---> 64             raise ValueError(f'Illegal argument(s) to subplot: {args}')
     65 
     66         self.update_params()

ValueError: Illegal argument(s) to subplot: (['y1', 'y2', 'y3', 'm1', 'm2', 'm3', 'm4', 'm5'], array([0.35, 0.36, 0.45, 0.43, 0.44, 0.45, 0.48, 0.45]))

请帮助理解这里的问题!

Answer 1

重用 Sahith Kurapati 的代码只是为了提供更简洁的解决方案。这样，您可以共享坐标轴，并且如果线条和图表样式都应该具有相同的样式，则仅配置一次。

import matplotlib.pyplot as plt
import numpy as np

plt.figure(1)
xaxis = ['y1','y2','y3','m1','m2','m3', 'm4', 'm5']
yy = np.array([[.73,.74,.71,.75,.72,.75,.74,.74],
              [.82,.80,.77,.81,.72,.81,.77,.77],
              [.35,.36,.45,.43,.44,.45,.48,.45],
              [.49,.52,.59,.58,.61,.65,.61,.58]])

fig, axes = plt.subplots(2, 2)
for y, ax in zip(yy, axes.ravel()):
    ax.plot(y)

plt.show()