#14630: Add `simplify_real` method to symbolic expressions
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Reporter: mjo | Owner: burcin
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Michael Orlitzky | Merged in:
Dependencies: | Stopgaps:
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Comment (by mjo):
Replying to [comment:7 burcin]:
> Instead of adding a new function `simplify_real()` or a `domain`
parameter to the existing functions, can we use a context manager instead?
>
> Example use would be:
>
> {{{
> sage: t = sqrt(x^2)
> sage: t.simplify()
> sqrt(x^2)
> sage: with maxima_domain(RR):
> ....: u = t.simplify()
> ....:
> sage: u
> abs(x)
> sage: t.simplify()
> sqrt(x^2)
> }}}
This is way better than what we currently have to do:
{{{
sage: maxima_lib.eval('domain: real;')
'real'
sage: (sqrt(x^2)).simplify()
abs(x)
sage: maxima_lib.eval('domain: complex;')
'complex'
}}}
but still does two things undesirably:
1. The user has to know about the maxima_domain() call, and there's no
easy way to find out about it. This is in contrast with `x.<tab>` "what
can I do with this expression?"
2. It ties the simplification to the maxima backend. If we ever want to
use sympy or some other backend, we're going to have a mess.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14630#comment:9>
Sage <http://www.sagemath.org>
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