Re: [Libmesh-devel] ErrorEstimator behavior for goal-oriented problems

[Roy S. <roy...@ic...>]

On Thu, 11 Oct 2012, John Peterson wrote:

> On Thu, Oct 11, 2012 at 10:45 AM, Roy Stogner <roy...@ic...> wrote:
>>
>> Vikram and I are waffling on this question, so I thought I'd throw it
>> out for everybody's feedback:
>>
>> For signed error estimates, e.g. estimates of Quantity-of-Interest
>> error where Q - Q_h ~= sum_E ( \eta_E ), what should the
>> estimate_error() method put in our ErrorVector?  The signed eta_E,
>> or the unsigned abs(eta_E)?
>
> If you decide to allow signed values in ErrorVector, be sure to also
> fix ErrorVector::minimum() which currently assumes only positive
> values are in the vector.

Will do.  But after looking at a buildbot regression tonight, I'm
starting to lean towards the unsigned option again: otherwise we
either need our ErrorVector data type to become complex-valued or
we're forced to have inconsistent behavior for --enable-complex.
---
Roy