On Thu, 14 Jun 2007, L.Guo wrote:

> About the data.
>
> The whole image is of type [[a]], and after being devided, it is also [[a]].

I would store an image in an (Array (Int,Int)). This is not only more
efficient, but also ensures statically that the image data is rectangular.
I assume that you do not need infinite images. They can be represented by
lists but not by arrays.
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