I'd like to use ComplexIntervalFieldElements in sparse vectors and matrices.
Comparison of intervals is somewhat delicate ( for a real interval field
element I:
I != 0 holds iff 0 is not contained in I
I == 0 holds iff I consists only of 0
bool(I) holds iff I does not consist of 0 only,
so bool(I) is equivalent to not I == 0,
but I != 0 is not equivalent to not I == 0.). I therefore changed one occurrence
of "if I != 0" in the construction of sparse vectors to "if I" in order to
avoid deletion of possibly non-zero entries:
http://trac.sagemath.org/ticket/17101
Furthermore, ComplexIntervalFieldElements had another comparison semantics. I
think that RealIntervalFieldElements and ComplexIntervalFieldElements should
have the same behaviour. Therefore, I modified ComplexIntervalFieldElement in
http://trac.sagemath.org/ticket/17105
On my machine, these changes did not cause any failing doctests (make
ptestlong); the buildbot for #17101 did fail, but I think that these failures
are unrelated and have been discussed on this list.
regards, CH
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