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Added a remark about data type efficiency

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Yann Esposito (Yogsototh) 2012-06-18 19:37:54 +02:00
parent 96315451dd
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01_Introduction/hglmandel.lhs
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@ -18,7 +18,9 @@ And the second part more focused on OpenGL and content.
> import Graphics.UI.GLUT
> import Data.IORef
For efficiency reason, I will not use the default Haskell `Complex` data type.
For efficiency reason[^010001], I will not use the default Haskell `Complex` data type.
[^010001]: I tried `Complex Double`, `Complex Float`, this current data type with `Double` and the actual version `Float`. For rendering a 1024x1024 Mandelbrot set it takes `Complex Double` about 6.8s, for `Complex Float` about 5.1s, for the actual version with `Double` and `Float` it takes about `1.6` sec. See these sources for testing yourself: [https://gist.github.com/2945043](https://gist.github.com/2945043). I haven't tried to use unpacked data type because it looks weird in a tutorial. But I might try it in a sequel.
> data Complex = C (Float,Float) deriving (Show,Eq)