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[Giovanni Piredda <address@hidden>]

I realized that there is an important difference: the "-" four times 
(which is the hrule macro) draws the line till the margin (minus 5 mm), 
while the assignment I wrote (which is perhaps better written as a 
macro: 
<assign|minus-sep|<macro|<with|line-width|1.25ln|<line|<point|0par|0.50ex>|<point|1par|0.50ex>>>>>) 
draws a line of 1par length regardless from where the line begins (so it 
can go beyond the margin).

So the hrule macro, the one invoked pressing four times the "-" key, may 
be better. It can also be adapted, e.g. 
<assign|red-hrule|<macro|<with|color|red|<hrule>>>>, but probably to 
change line style and dashing one needs to change the hrule itself 
(which is in turn based on the datom macro).

G.



On 12.02.21 18:51, Ibrahima Fall wrote:
> Yes Giovanni, It's quite the same except this is just a kind of shortcut.
>
> best
>
> Le ven. 12 févr. 2021 à 14:59, Giovanni Piredda <address@hidden 
> <mailto:address@hidden>> a écrit :
>
>     This shortcut is very nice.
>
>     I figured out that it is either the same or almost the same as
>
>     
> <assign|minus-sep|<with|line-width|1.5ln|<line|<point|0par|0.5ex>|<point|1par|0.5ex>>>>
>
>     On 12.02.21 15:32, Ibrahima Fall wrote:
>     > Hi;
>     > Just type the "-" (minus sign or hyphen) four times.
>     > "----"
>     >
>     > best regards
>     >
>     > Le ven. 12 févr. 2021 à 14:02, Giovanni Piredda
>     <address@hidden <mailto:address@hidden>
>     > <mailto:address@hidden <mailto:address@hidden>>> a écrit :
>     >
>     >     Waiting that someone else gives a better answer, you can use
>     this
>     >     function
>     >
>     >     (lambda ()(stree->tree '(line (point "0par" "0par") (point
>     "1par"
>     >     "0par"))))
>     >
>     >     which you can conveniently put in an extern macro and assign
>     to a
>     >     "separator" macro:
>     >
>     >     <assign|separator|<extern|(lambda ()(stree-\<gtr\>tree '(line
>     >     (point "0par"
>     >     "0par") (point "1par" "0par"))))>>
>     >
>     >     G.
>     >
>     >
>     >     On 12.02.21 14:53, Frank wrote:
>     >     > Dear all,
>     >     >
>     >     > I wonder how to insert an horizontal separator. For
>     example, when I
>     >     > prepare a set of problems, I want to put a separator so
>     that the
>     >     > exercises in each group are closely related.
>     >     >
>     >     > Best,
>     >     > Frank
>     >