Home/ Questions/Stabilizing the error: no handles with labels found to put in legend with the best answers
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Jules Etienne
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Asked: 2022-05-11T19:04:17+00:00 In:

Stabilizing the error: no handles with labels found to put in legend with the best answers

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I’m building a new program, but when I run it, an error pops up. The error displayed is as follows:

No handles with labels found to put in legend.

I have tried several workarounds, but they still do not get the desired results. If you have come across this situation and have a solution for the no handles with labels found to put in legend problem, pls let me know. This is what I do:

fig = plt.figure()
 ax = fig.add_subplot(111)
 ax.spines['left'].set_position('zero')
 ax.spines['right'].set_color('none')
 ax.spines['bottom'].set_position('zero')
 ax.spines['top'].set_color('none')
 plt.axis([-5,5,-5,5])
 ax.xaxis.set_ticks_position('bottom')
 ax.yaxis.set_ticks_position('left')
 plt.grid()
 plt.arrow(0,0, 3,1, head_width=0.2, color='r', length_includes_head=True, label='u')
 plt.arrow(0,0, 1,3, head_width=0.2, color='r', length_includes_head=True, label='v')
 plt.arrow(0,0, 4,4, head_width=0.2, color='r', length_includes_head=True, label='u+v')
 plt.legend()

Thanks.

matplotlib
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2 Answers

  1. Best Answer
    Expert

    The cause: The cause of the error was using method plt.legend()

    Solution: You need to change plt.legend() into ax.legend() as the following code:

    fig = plt.figure()
ax = fig.add_subplot(111)
ax.spines['left'].set_position('zero')
ax.spines['right'].set_color('none')
ax.spines['bottom'].set_position('zero')
ax.spines['top'].set_color('none')
plt.axis([-5,5,-5,5])
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
plt.grid()
plt.arrow(0,0, 3,1, head_width=0.2, color='r', length_includes_head=True, label='u')
plt.arrow(0,0, 1,3, head_width=0.2, color='r', length_includes_head=True, label='v')
plt.arrow(0,0, 4,4, head_width=0.2, color='r', length_includes_head=True, label='u+v')
ax.legend()

     

    • 23

  2. The legend can be used to define the elements.

    For full control of which artists have a legend entry, it is possible to pass an iterable of legend artists followed by an iterable of legend labels respectively. Reference

    Example: 

    arr1 = plt.arrow(0,0, 3,1, head_width=0.2, color='r', length_includes_head=True)
arr2 = plt.arrow(0,0, 1,3, head_width=0.2, color='g', length_includes_head=True)
arr3 = plt.arrow(0,0, 4,4, head_width=0.2, color='b', length_includes_head=True)

plt.xlim(0,5)
plt.ylim(0,5)

plt.legend([arr1, arr2, arr3], ['u','v','u+v'])


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