Re: [eigen] Machine precision<> too coarse

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2009/2/3 Benoit Jacob <jacob.benoit.1@xxxxxxxxx>:
> And this is being very very sensitive to the context. For example, as
> I said, the partial pivoting LU gives 100x more imprecision than the
> full pivoting LU,

One more thing: this 100x difference was with double. With float, (to
my relief) the difference is much smaller, more like x2.

This also suggests that a general formula depending on machine epsilon
would look very complicated. Simple formulas like the one you pasted
above don't account for this kind of phenomenon.


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