I recently installed Atom as an IDE on my laptop, for university. I installed Hydrogen as a convenient solution to show some plots on the go. But whenever I run Hydrogen, I get this error:

NameError Traceback (most recent call last) < ipython-input-1-1eb00ff78cf2> in <module> ----> 1 plt.show() NameError: name 'plt' is not defined

However Matplotlib is working properly when executed normally, and IPython seems to do as well. This is the code I'm trying to run test-wise:

%matplotlib ipympl import matplotlib.pyplot as plt a_x=[1,2,3,4,5,6] a_y=[1,2,3,4,5,6] plt.plot(a_x, a_y) plt.show()

A video of the problem is available here.

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  • Selected Run

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  • Resulting error

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2 Answers

You have to import the library first. Add this at start of the code.-

from matplotlib import pyplot as plt
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  • You ran one line, not the whole file.
  • You can see the problem by carefully reading the traceback. Line 9 in the script is line 1 in the traceback: ----> 1 plt.show()
  • The solution is to run the whole file not one line, i.e. click Run All not Run.
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