#19863: Static error rate channel does not always add as many errors as expected
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Reporter: dlucas | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-7.0
Component: coding theory | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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I noticed the following:
{{{
V = VectorSpace(GF(2), 2)
Chan = channels.StaticErrorRateChannel(V, 1)
for i in range(100):
c = V.random_element()
r = Chan(c)
assert c != r
AssertionError
}}}
This is due to a line in the `transmit_unsafe` methods which replaces
values of the transmitted vector by random values picked from the base
ring of the transmitted vector.
It works with high probability for big rings, but obviously not for my
example.
In any case, it does not respect the promised behaviour and thus should be
fixed.
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Ticket URL: <http://trac.sagemath.org/ticket/19863>
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