Why when I want to graph f=x^(1/3) I get the following error?
In this case, what should I do to get the complete graph?



sage:  plot(x^(1/3),x,-1,1)

verbose 0 (2999: plot.py, generate_plot_points) WARNING: When
plotting,
failed to evaluate function at 100 points.
verbose 0 (2999: plot.py, generate_plot_points) Last error message:
'negative number to a fractional power not real'


And the graph goes wrong

Greetings

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