[Math] MATH-519

[Gilles Sadowski <gi...@harfang.homelinux.org>]

[Please refer to
  https://issues.apache.org/jira/browse/MATH-519
for the context of this discussion.]

Hi Luc.

> Anyway, returning NaN or POSITIVE_INFINITY would work only with some
> optimizers.

Do you mean that it would fail with some optimization _algorithms_ or some
unsafe _implementations_ of those algorithms?

In the former case, would "Double.MAX_VALUE" be OK?
In the latter, wouldn't there be a way to make the implementations behave
correctly in the face of those "special" values?

> For simple bounds on estimated parameters, this can be done using
> intermediate variables and mapping functions, [...]

Yes, but that would be slightly less efficient (because of additional
function calls).
If this is the best choice, I'll implement a "conversion" class (for the
"simple" bound case).


Best,
Gilles

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