Pyplot图例索引错误:元组索引超出范围

问题描述:

在定义了ax1=fig1.add_subplot(111)并绘制了8个数据系列以及相关的label值后,我使用以下代码行添加图例。Pyplot图例索引错误:元组索引超出范围

ax1.legend(loc='center left', bbox_to_anchor=(1.0, 0.5)) 

我以前多次已经利用这种方法没有问题,但这次它会产生一个错误说IndexError: tuple index out of range

Traceback (most recent call last): 
    File "interface_tension_adhesion_plotter.py", line 45, in <module> 
     ax1.legend(loc='center left', bbox_to_anchor=(1.0, 0.5)) 
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/axes/_axes.py", line 564, in legend 
     self.legend_ = mlegend.Legend(self, handles, labels, **kwargs) 
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/legend.py", line 386, in __init__ 
     self._init_legend_box(handles, labels, markerfirst) 
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/legend.py", line 655, in _init_legend_box 
     fontsize, handlebox)) 
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/legend_handler.py", line 119, in legend_artist 
     fontsize, handlebox.get_transform()) 
    File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/matplotlib/legend_handler.py", line 476, in create_artists 
     self.update_prop(coll, barlinecols[0], legend) 
IndexError: tuple index out of range 

我不知道为什么会这样,真的希望建议。

+0

这似乎与绘制错误条有关。但为了帮助你,你需要提供[mcve]。 – ImportanceOfBeingErnest

+1

确实用误差线绘制:'ax1.errorbar(tensionsarray,meanproportionsarray,yerr = stdproportionsarray,label =“adhsion = {:02.1f}”。format(l))' – crevell

+0

这不是[mcve]。 [编辑]你的问题,如果你想提供更多的信息。 – ImportanceOfBeingErnest


1.如果数据完好无损且数组不为空,则此代码完美工作。

fig = plt.gcf() 
ax=fig.add_subplot(111) 

for i in range(8): 
    x = np.arange(10) 
    y = i + random.rand(10) 
    yerr = .1*y 
    l = .1*i 
    ax.errorbar(x,y,yerr=yerr,label="adhsion={:02.1f}".format(l)) 

ax.legend(loc='center left', bbox_to_anchor=(1.0, 0.5)) 

enter image description here
2.当我申请一个过滤器,以我的数据,并得到空数组我有同样的错误。这可以抄录如下:

fig = plt.gcf() 
ax=fig.add_subplot(111) 

for i in range(8): 
    x = np.arange(10) 
    y = i + random.rand(10) 
    yerr = .1*y 
    l = .1*i 
    if i == 7: 
     ind = np.isnan(y) 
     y = y[ind] 
     x = x[ind] 
     yerr = yerr[ind] 
    ax.errorbar(x,y,yerr=yerr,label="adhsion={:02.1f}".format(l)) 

ax.legend(loc='center left', bbox_to_anchor=(1.0, 0.5)) 


该代码给出了相同的回溯中的问题。 空数组错误导致错误条柄错误。通过@crevell提到


解决方法:

handles, labels = ax.get_legend_handles_labels() 
handles = [h[0] for h in handles] 
ax.legend(handles, labels,loc='center left', bbox_to_anchor=(1.0, 0.5)) 


它的工作原理,但传说似乎没有errorbar线。

enter image description here

所以要检查提供给matplotlib errorbar功能的数据。