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  1. import numpy as np
  2.  
  3. import matplotlib.pyplot as pl
  4.  
  5. import sys
  6.  
  7. a = -3
  8. b = 5
  9. file1 ='1111'
  10.  
  11. y, x = np.ogrid[-5:5:100j, -5:5:100j]
  12. plt.contour(x.ravel(), y.ravel(), pow(y, 2) - pow(x, 3) - x * a - b, [0])
  13. plt.grid()
  14. plt.show()
Runtime error #stdin #stdout #stderr 0.56s 59224KB
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Standard input is empty
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Standard output is empty
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Traceback (most recent call last):
  File "prog.py", line 12, in <module>
NameError: name 'plt' is not defined
https://ideone.com/3KBy6W
language:
Python (cpython 2.7.16)
created:
4 years ago
visibility:
public

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