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add methods to query representation of symbolic expressions #7603

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burcin opened this issue Dec 4, 2009 · 4 comments
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add methods to query representation of symbolic expressions #7603

burcin opened this issue Dec 4, 2009 · 4 comments
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c: symbolics p: minor / 4 t: enhancement
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sage-4.3

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burcin commented Dec 4, 2009

Attached patch adds _is_symbol(), _is_constant() and _is_numeric() methods to sage.symbolic.expression.Expression objects.

These methods are just a thin wrapper around the is_a<*>() methods from pynac. They should provide a straightforward interface to query the internal representation of a symbolic expression when .operator() returns None.

Some relevant discussion on sage-devel:

http://groups.google.com/group/sage-devel/msg/6323b473af195bc7

CC: @sagetrac-fmaltey

Component: symbolics

Author: Burcin Erocal

Reviewer: Mike Hansen

Merged: sage-4.3.rc0

Issue created by migration from https://trac.sagemath.org/ticket/7603
@burcin burcin added this to the sage-4.3 milestone Dec 4, 2009
@burcin burcin self-assigned this Dec 4, 2009
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burcin commented Dec 4, 2009

Attachment: trac_7603-is_symbol.patch.gz

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mwhansen commented Dec 6, 2009

comment:2

Looks good.

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mwhansen commented Dec 6, 2009

Merged: sage-4.3.rc0

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mwhansen commented Dec 6, 2009

Reviewer: Mike Hansen

@mwhansen mwhansen closed this as completed Dec 6, 2009
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c: symbolics p: minor / 4 t: enhancement
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