#20179: add a free_variables() method?
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Reporter: wonder | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.1
Component: symbolics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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It can be useful to query the free variables in an expression. SR's
`variables()` and `arguments()` return all variables in an expression,
whether free or bound. For example:
{{{
sage: var('y')
y
sage: function('f')
f
sage: e = limit( f(x,y), x=0 )
sage: e
limit(f(x, y), x, 0)
sage: e.variables()
(x, y)
}}}
I would like to have a `free_variables()` method that returns only `y` in
this case. Is there a recommended way to get this information from an
expression?
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Ticket URL: <http://trac.sagemath.org/ticket/20179>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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