I couldn't find the function which converts a List to a Tuple type. 
PsiLAb for example expects for initializing of arrays a Tuple construct:

let a = imatrix ~const:[1,2,3 ; 4,5,6] ();;

which would yield:  

1 2 3
4 5 6

But I think the common case actually is that one has something like 
this: [[1;2;3];[4;5;6]]. How to convert this to: [1,2,3 ; 4,5,6] ?

Another question. PsiLAB relies in Bigarrays. How is it possible to 
convert a OCaml array to bigarray? The OCaml book has a chapter about 
bigarrays but no concrete examples how to do this.                    
                   

S. Gonzi

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