#11356: Companion matrix constructor
------------------------------+---------------------------------------------
Reporter: rbeezer | Owner: jason, was
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-4.7.1
Component: linear algebra | Keywords: beginner, sd31
Work_issues: | Upstream: N/A
Reviewer: | Author: Rob Beezer
Merged: | Dependencies:
------------------------------+---------------------------------------------
Old description:
> This will be used to construct the output of an upcoming rational
> canonical form.
>
> '''Apply:'''
>
> 1. [attachment:trac_11356-companion-matrix-v3.patch]
New description:
This will be used to construct the output of an upcoming rational
canonical form.
'''Apply:'''
1. [attachment:trac_11356-companion-matrix-v4.patch]
--
Comment(by rbeezer):
Replying to [comment:13 ddrake]:
Thanks, Dan.
Seems like an input list of {{{[1]}}} should be a monic polynomial that
creates an empty matrix. Code does that before latest patch and a test of
this has been added in the v4 patch.
So I made an input empty list fail in the v4 patch and added a test. In
this case, {{{n = -1}}}, so various existing array references will fail,
thus requiring its own error message. I tried to build an "empty
polynomial" from an empty list, but just got the zero polynomial. So I
think an empty list is the only danger, thus the error message reads this
way.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11356#comment:14>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
