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Graphing inequality on a number line?

asked 2014-08-18 15:11:18 -0600

I can certainly get the solution set for $x^2 - 9 \geq 0$, but how do I get this solution set visualized on a number line?

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1-d plots are not implemented - see http://trac.sagemath.org/ticket/9793

kcrisman gravatar imagekcrisman ( 2014-08-18 17:14:01 -0600 )edit

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answered 2014-08-18 17:44:46 -0600

tmonteil gravatar image

updated 2014-08-18 17:49:01 -0600

You can get the characteristic function of the solution set (which is a list of lists of symbolic elements) as follows:

sage: s = solve(x^2 - 9 >= 0, x)
sage: f = lambda t : min(1, sum([bool(i[0](t)) for i in s]))

and then plot it to see the solution set:

sage: plot(f,-10,10)

or even:

sage: plot(f,-10,10, fill='axis')
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Asked: 2014-08-18 15:11:18 -0600

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Last updated: Aug 18 '14