> The biggest problem is that there is no OCaml build in type complex
> and that the Bigarray doesn't have complex too (sometime ago I read
> that someone was thinking about adding complex numbers to the
> Bigarray module, I would appreciate this very much).

Adding complex arrays to the Bigarray module is on my to-do list.

One issue is how these arrays should be represented to allow
no-copying exchange between C and Fortran.  My understanding is that
in C, arrays of complex are generally represented as arrays of pairs
of floats (or doubles), while in Fortran some codes use the C
representation (one array of pairs) while others use a pair of arrays.
The array-of-pairs representation fits well the Bigarray interface,
but the pair-of-arrays approach does not.  

Could someone with numerical experience in Fortran provide more
information on this?

- Xavier Leroy
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