> But why was the error on p=v.(i) and not on the printf line itself ?
[..]
>   briand> File "sweep.ml", line 30, characters 6-115:
>   briand> Warning: this function application is partial,
>   briand> maybe some arguments are missing.
[..]
>   briand>       let p = v.(i) in
>   briand>       let f = p.freq in
>   briand>       let z = p.data in
>   briand> 	Printf.printf "%.3e %.3e\n" (number_db (Complex.norm2 z));

I can't tell which line is line 30, but none of your lines are 115
characters long.  Count 109 characters from the "let" in "let p =
v.(i)", and I suspect you reach the printf.

OCaml often seems to be confused about lines in error messages.

HTH.

--KW 8-)

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