#7537: list(SR('c').iterator()) is empty
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Reporter: malb | Owner: burcin
Type: defect | Status: new
Priority: critical | Milestone: sage-4.3.4
Component: symbolics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by burcin):
I don't think this is a bug. :)
It doesn't make sense to iterate over variables, constants or numeric
coefficients. Iterators are only available over `add`, `mul`, and `pow`
objects, which correspond to the obvious mathematical operations.
AFAICT, this is also the case in MMA:
{{{
Mathematica 7.0 for Linux x86 (32-bit)
Copyright 1988-2008 Wolfram Research, Inc.
In[1]:= T=x+1
Out[1]= 1 + x
In[2]:= T
Out[2]= 1 + x
In[3]:= T[[1]]
Out[3]= 1
In[4]:= X
Out[4]= X
In[5]:= X[[1]]
Part::partd: Part specification X[[1]] is longer than depth of object.
Out[5]= X[[1]]
}}}
We can raise a `ValueError` if the expression corresponds to a `symbol`,
`constant` or `numeric` object. The docstring should also be enhanced to
point to the data structure for symbolic expressions here:
http://www.ginac.de/tutorial/Internal-representation-of-products-and-
sums.html
Comments?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7537#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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