I think that FullPivLU should stop the decomposition if and only if it encounters an exact 0, just like PartialPivLU does. Thresholding should only happen when computing the rank and the like. See for instance this thread: http://forum.kde.org/viewtopic.php?f=74&t=97884
Sounds like a good idea. I didn't know/remember that FullPivLU behaved like that. Indeed, the threshold stuff should only affect rank() and the like.
fixed by: e5fa60b5e3d7, 06fa6099f5b5
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