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by tromp
419 days ago
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That list is of type (Fractional a, Enum a) => [a], but ghci defaults to Doubles, as you can see from ghci> [0, 0.3 .. 2.0] :: [Float]
[0.0,0.3,0.6,0.90000004,1.2,1.5,1.8000001,2.1000001]
ghci> [0, 0.3 .. 2.0] :: [Double]
[0.0,0.3,0.6,0.8999999999999999,1.2,1.5,1.7999999999999998,2.1]
Exceeding the upper bound by 0.1 is not due to a general floating gotcha, but a specific choice in the definition of typeclass method enumFromThenTo for both Floats and Doubles. |
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