#20198: `LinearCode(C)` for some code `C` should construct a code
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Reporter: jsrn | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.1
Component: coding theory | Resolution:
Keywords: linear code, beginner | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jsrn:
Old description:
> With the recent sub-classing framework for linear codes, it is now often
> useful to recast a code from some family as a generic linear code, thus
> forgetting its structure, e.g.
>
> {{{
> sage: C = codes.GeneralizedReedSolomonCode(GF(23).list(), 12)
> sage: Chan = channels.StaticErrorRateChannel(GF(23)^7, 2)
> sage: %timeit C.decode(Chan(C.random_element()))
> <some short time>
> sage: C_dumb = LinearCode(C)
> sage: %timeit C.decode(Chan(C.random_element()))
> <loong time>
> }}}
>
> Except the above code doesn't work, since `LinearCode` expects a matrix,
> and can't understand a code as input.
New description:
With the recent sub-classing framework for linear codes, it is now often
useful to recast a code from some family as a generic linear code, thus
forgetting its structure, e.g.
{{{
sage: C = codes.GeneralizedReedSolomonCode(GF(23).list(), 12)
sage: Chan = channels.StaticErrorRateChannel(GF(23)^7, 2)
sage: %timeit C.decode(Chan(C.random_element()))
<some short time>
sage: C_dumb = LinearCode(C)
sage: %timeit C_dumb.decode(Chan(C_dumb.random_element()))
<loong time>
}}}
Except the above code doesn't work, since `LinearCode` expects a matrix,
and can't understand a code as input.
--
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Ticket URL: <http://trac.sagemath.org/ticket/20198#comment:1>
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