On Fri, Jul 08, 2022 at 11:08:18PM +0200, carlmarcos--- via Users list for the GNU Emacs text editor wrote:

[...]

> Yes, but what should I put for the prefix value when using the function non-interactively?

Please, read the manual. There is a section dedicated
exactly to that (which one, that is left as an exercise
to the reader).

It is a prefix *argument*. So non-interactively, you
pass it as an argument.

Cheers
-- 
t