#20433: InteractiveLPBackend: Implement set_verbosity
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Reporter: mkoeppe | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.2
Component: numerical | Resolution:
Keywords: lp | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by mkoeppe):
Replying to [comment:7 novoselt]:
> It uses Bland's rule, so no cycles should happen.
The pivot rule used would probably be worth mentioning in the
documentation.
>
> I don't see a point in warnings (and especially errors) for inexact
field, otherwise we should start with warnings about stuff like
> {{{
> sage: one_third = RR(1/3)
> sage: one_third
> 0.333333333333333
> sage: 1 - one_third - one_third - one_third
> 1.11022302462516e-16
> KeyboardInterrupt
> sage: - one_third - one_third + 1 - one_third
> 5.55111512312578e-17
> sage: - one_third - one_third - one_third + 1
> 0.000000000000000
> }}}
> In teaching I found it quite natural to use my module with
`RealField(20)` to get usually sensible results in sensible
representations for word problems. When bad things do happen, it is a
great point to illustrate that blindly trusting computers is not a good
idea and using simplex method in practice is a bit more complicated than
it sounds ;-)
I think there's a difference between basic arithmetic and a packaged
algorithm implementation. One usually one would expect that an
implementation that accepts floating point numbers has some kind of
accommodation for floating point fuzz in the form of some epsilon.
But, in any case, just a suggestion.
--
Ticket URL: <http://trac.sagemath.org/ticket/20433#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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