#18742: interactive_simplex_method: Support several styles corresponding to
major
textbooks
-------------------------------------+-------------------------------------
Reporter: mkoeppe | Owner:
Type: task | Status: needs_work
Priority: minor | Milestone: sage-6.8
Component: numerical | Resolution:
Keywords: beginner, lp, | Merged in:
teaching | Reviewers: Andrey Novoseltsev
Authors: Peijun Xiao, | Work issues: switch to
Matthias Koeppe | dictionaries of default names
Report Upstream: N/A | Commit:
Branch: | 8f5c7a43f2109a30f7e0dd95df1218a66c96e836
u/novoselt/interactive_simplex_method__support_several_styles_corresponding_to_major_textbooks|
Stopgaps:
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by novoselt):
* work_issues: clean up default names logic => switch to dictionaries of
default names
Comment:
Replying to [comment:23 mkoeppe]:
> Replying to [comment:22 novoselt]:
> > - Every function has to have input/output blocks if there is any
input/output.
> Do you want us to work on this, or do you plan to make more changes?
I've changed it in my commit ;-)
> > - I still feel like overall logic will be cleaner if there was a
single style rather than separate for each problem - no need to drug style
arguments around and pass it along to every newly constructed instance, or
engage in aforementioned copy-pasting. I just don't see under what
circumstances someone will want to actively work with different styles at
once. Can I rewrite things without `style` argument to
problems/dictionaries?
>
> Since the style affects default names of primal and dual, I would be a
bit concerned about what happens when a user creates a problem P, then
changes the global style, then dualizes the problem. However, if this can
be done consistently, I have no strong objections to having just a global
style variable.
There will be some mix of default naming schemes. But: 1) this should not
affect correctness of anything, 2) there will still be an option to
override names, 3) I don't see it as a use case. I think that the most
likely situation is that users will use whatever style is the default one
(so there is some sense in picking "the most common one" as the default).
Those who do figure out the style option are most likely to use it in the
beginning of a session and roll with it. Those who discover it midway will
likely still put it into beginning and rerun all commands. I don't have
any facts to support these speculations, of course, but I will be
surprised if they are wrong.
> > - Is there any default auxiliary variable name in Vanderbei?
>
> What do you mean by auxiliary variable? The one in a primal phase I?
That's x0.
Yes - that's the one. It should be x0 at the moment in both styles.
My plan for tomorrow is to implement the dictionary approach for the
names. And get rid of `style` argument if I manage to convince you about
it ;-)
--
Ticket URL: <http://trac.sagemath.org/ticket/18742#comment:24>
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 unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
