reopen 1003395
retitle plfit: under-the-radar numerical issue


Hi,

I am re-opening the issue because
it has simply gone under the radar but it is still there.

The issue is a numerical issue that deserves an appropriate numerical analysis.
The upstream code currently workarounds by using at some point `long double`.
This is a very bad numerical practice: all the computation must be made with 
`double`.
The issue is actually not numerically trivial. I am on my way to elaborate a 
numerical fix.

Best wishes,
Jerome

--
Jerome BENOIT | calculus+at-rezozer^dot*net
https://qa.debian.org/developer.php?login=calcu...@rezozer.net
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