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How to get the variables present in an boolean expression

asked 2014-08-10 04:21:15 +0200

pp gravatar image

updated 2014-08-10 08:15:41 +0200

Consider the boolean variables x, y and z.

I need something like

 sage: variables(x+yz)
 [x, y, z]
 sage: variables(x+z)
 [x, z]

What should I do?

For a starting point, you may like (copied from the answer given here):

sage: R = BooleanPolynomialRing(3, 'x')
sage: x, y, z = R.gens()
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answered 2014-08-10 10:20:59 +0200

FrédéricC gravatar image

updated 2014-08-10 14:49:57 +0200

You should read the doc before asking such questions here.

In particular, give a name to your object and use the automatic TAB-completion to get the list of available methods. In this way, you can learn about the methods .degree and .variables by hitting the TAB key after too.

sage: sage: R = BooleanPolynomialRing(3, 'x')
sage: sage: x, y, z = R.gens()
sage: too = x+z
sage: sage: too.v   # (pressing TAB key here)
too.variable          too.vars_as_monomial  
too.variables         too.version           
sage: too.variables()
(x0, x2)
sage: len(too.variables())
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Asked: 2014-08-10 04:21:15 +0200

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Last updated: Aug 10 '14