odswrite: Determining sheet range?

[Peter P.]

Hi, I am trying to write a cell array back to an .ods file. The ods
function requires me to pass a range parameter like "A1:M12" as
argument. An empty range is not possible. I wonder how this range can
be automatically determined from the array dimensions, which in my
case is variable. I would like to build a workaround dealing with all
letters in the alphabeth trying to find a translation.

Thanks for any pointers!
P