Maybe
format "%d %d" {*}[concat {*}$m]
{*}[join $m] might do as well but that's documented to actually return
a space separated string which will be implicitly converted back to
list. Not sure if that's will give the exact same results in all cases.
Hi APN,
thak you for the reply !
Concat is a good idea and will work.
---
I often find myself to write somthing like:
% format "%d %d" {*}[lindex $m 0]
(with [llrngth $m] ==1) and I would find it more elegant to write a
double delist operator.
A "double-delist" (like the {*}[concat {*}] suggested by Ashok) will
also flatten something like {{1 2} {3 4}}, so it's a bit of
overgeneralization.
IMO, {*}[lindex] is a more pertinent method here.
-Alex