sage: def f1(x):  return sum(i for i in range(x))
sage: f1(20)
190
sage: pl1=plot(f1,2,4);pl1
verbose 0 (3965: plot.py, generate_plot_points) WARNING: When
plotting, failed to evaluate function at 200 points.
verbose 0 (3965: plot.py, generate_plot_points) Last error message:
''float' object cannot be interpreted as an integer'

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