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| 2018-12-28 20:22:27 +0200 | received badge | ● Student (source) |
| 2018-12-28 20:12:24 +0200 | asked a question | Why doesn't assume(x, 'real') exclude complex values when using plot(x^(1/3)) over a negative domain? Running the following commands: assume(x,'real') plot(x^(1/3), -5, 5) produces the following error: verbose 0 (3630: plot.py, generate_plot_points) WARNING: When plotting, failed to evaluate function at 100 points. verbose 0 (3630: plot.py, generate_plot_points) Last error message: 'negative number cannot be raised to a fractional power' Shouldn't the assume command take care of this? Thanks. |
Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.