( first at all, my English is not good. )
I'm trying to do the following:
if $i1 >= 13 then out=$i1-12 else $i1
" out=$i1-12 "
how can I do that?
I just want numbers over 12 to be subtracted by 12.
is it clear?
the solution I find is using the i$2 with one more object with the $i1-12 expr, so...
if $i1 >= 13 then $i2 else $i1
where $i2 is "$i1-12"
but... i'm sure there is a way to do this with one single "if sentence", isn't it?