>  As a palliative a function for
> inter-converting portions of Bigarrays and strings would be welcome,
> as access to strings is much faster.
> 

If you don't mind giving up a bit of safety the following may help. 

Chris Q.

module UnsafeStringOps = struct
  (* Warning: No bounds checking!!!! Coredump grade hack *)

  let ba2str : ('a,'b,'c) Bigarray.Array1.t -> string =
    fun arr -> Obj.obj (Obj.field (Obj.repr arr) 1)

(* Or more properly:
external ba2str: ('a,'b,'c) Bigarray.Array1.t -> string ="ba2str"

where from C you put:
#include <bigarray.h>
value ba2str(value arr){ return Data_bigarray_val(arr); }
*)

  let blit = String.unsafe_blit
  let fill = String.unsafe_fill
  let set = String.unsafe_set
  let get = String.unsafe_get
end
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