quartic_gradient:
  Python version: 3.6.8
  Seek local minimizer of a scalar function f(x) in [ -2.0 , 2.0 ]

  Graphics saved in "quartic.png"
  1  -0.837326  17.3413  3.00211
  2  -0.987432  17.0138  1.19731
  3  -1.0473  16.9715  0.188702
  4  -1.05673  16.9705  0.0135692
  5  -1.05741  16.9705  0.000802191
  Reached end of descent: |f(x)| =  [0.00080219]  < tol =  0.001

  Graphics saved in "quartic_minimizer.png"

quartic_gradient:
  Normal end of execution.