#15364: Introduce factor_or_zero into global namespace
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Reporter: zabrocki | Owner:
Type: PLEASE CHANGE | Status: new
Priority: major | Milestone: sage-5.13
Component: factorization | Resolution:
Keywords: | Merged in:
Authors: Mike Zabrocki | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by zabrocki):
I think that is one of many scenarios. The purpose of this function is
biased towards number theory. Most of my colleagues use it in algebra to
put coefficients in a readable form. I just want to give people who use
algebra a less onerous alternative. I don't want to have to put an if
statement ''every'' time that I factor an algebraic expression.
Solution during Sage Days on Monday (which completely stopped everything
for much longer than was necessary):
{{{
sage: map(factor, list_of_coefficients)
ArithmeticError
sage: list_coefficients.remove(0)
sage: map(factor, list_of_coefficients)
}}}
A more common scenario is
{{{
sage: factor(1/(1-x)-x/(1-x)-1)
ValueError: factorization of 0 not defined
}}}
Or that a similar expression should come up as the coefficient of some
element in an algebra and one should want to
`elt.map_coefficients(factor)`.
--
Ticket URL: <http://trac.sagemath.org/ticket/15364#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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