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Improve the distribution of scaleLinear #405

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merged 2 commits into from
Oct 8, 2020
Merged

Improve the distribution of scaleLinear #405

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a17fc72
improve the distribution of scaleLinear
jonfowler Oct 8, 2020
9a88f44
Style nits (STYLE_GUIDE.md)
moodmosaic Oct 8, 2020
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8 changes: 7 additions & 1 deletion hedgehog/src/Hedgehog/Internal/Range.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -305,8 +305,14 @@ scaleLinear sz0 z0 n0 =
n =
toInteger n0

-- @rng@ has magnitude 1 bigger than the biggest diff
-- i.e. it specifies the range the diff can be in [0,rng)
-- with the upper bound being exclusive.
rng =
n - z + signum (n - z)

diff =
((n - z) * fromIntegral sz) `quot` 99
(rng * fromIntegral sz) `quot` 100
in
fromInteger $ z + diff

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