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8 changes: 5 additions & 3 deletions src/Diagrams/CubicSpline/Internal.hs
Original file line number Diff line number Diff line change
Expand Up @@ -50,12 +50,14 @@ solveCubicSplineDerivativesClosed xs = solveCyclicTriDiagonal as bs as ds 1 1
solveCubicSplineCoefficients :: Fractional a => Bool -> [a] -> [[a]]
solveCubicSplineCoefficients closed xs =
[ [x,d,3*(x1-x)-2*d-d1,2*(x-x1)+d+d1]
| (x,x1,d,d1) <- zip4 xs' (tail xs') ds' (tail ds')
| (x,x1,d,d1) <- zip4 xs' (drop 1 xs') ds' (drop 1 ds')
]
where
ds | closed = solveCubicSplineDerivativesClosed xs
| otherwise = solveCubicSplineDerivatives xs
close as | closed = as ++ [head as]
| otherwise = as
close [] = []
close as@(a:_)
| closed = as ++ [a]
| otherwise = as
xs' = close xs
ds' = close ds
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