Hi Francisco, just a few words about arrays and image manipulation.

I've been doing some work along this way and encountered multiple issues. 
One of them was with slicing. If I'm not wrong Robin's work will be merged 
in 0.19 but meanwhile, you should be aware that there are few issues with 
the current arrays, especially large ones [1]. You can already use his 
library as a drop-in replacement though.

I was also about to mention the numelm project but I think you know about 
it ^^. Regarding those kind of operations (slicing, transposing, ...) I 
think a generic image (/tensor) type would benefit a lot from having lazy 
"views" [2] and expressions of matrices as explained in the xtensor [3] 
project I mentionned in your numelm post.

Cheers and good luck for this amazing project!

[1] elm 0.18 array issues : https://github.com/elm-lang/core/issues/649
[2] lazy views at 12:30 : https://youtu.be/mwIQUgigjbE?t=12m30s
[3] https://github.com/QuantStack/xtensor

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