Hi Marc,

Probably an even a better solution would be to automatically generate
the table using a computer algebra system.  One day, if I have time...

Best wishes, --Joris


On Thu, Nov 11, 2021 at 11:22:32PM +0100, marc lalaude-labayle wrote:
> Hi Joris, Vincent and texmacs-users.
>
> Here is a link to create "tableaux de variations", a french didactical tool
> to study functions :
> http://math.et.info.free.fr/TikZ/TableauxVariations/index.html
>
> It's pretty convincing when tested with my colleagues.
>
> Best.
>
> Marc
>
> Le jeu. 11 nov. 2021 à 23:18, TeXmacs <address@hidden> a
> écrit :
>
> > Hi Vincent,
> >
> > I agree that it would be nice to do something to make this easier.
> > For the moment, you may also use the picture editor for this.
> > This is a bit less constraint, and less handy for drawing
> > the horizontal and vertical lines of the table.
> > Still, it might sometimes have its advantages: if you want
> > special dotted or double lines, precise control over where
> > you wish to put certain values, etc.
> >
> > Best wishes, --Joris
> >
> >
> > On Wed, Sep 01, 2021 at 09:20:40AM +0200, vincent douce wrote:
> > > hi
> > > i am wondering that something simple could be done to make tableaux de
> > variation easy to build inside TeXmacs
> > > some items related with tabulation are missing for the moment :
> > >
> > > an equivalent of esc-esc-tab that would not create a blanck space but an
> > extensible diagonale arrow (right-down ↘︎ and right-up ➚)
> > > an equivalent of esc-esc-tab that would  a blanck space with a + or a -
> > at the middle
> > > say, if :
> > > * esc-esc-/ would create and extensible right-up ➚ arrow
> > > * esc-esc-\ would create and extensible right-down ↘︎ arrow
> > > * esc-esc-+ would create and extensible space with a + at the middle
> > > * esc-esc-– would create and extensible space with a - at the middle
> > > then i would create a tableau de variation by making a large bloc with 3
> > lines and, for example for x|->2x^3-3x^2 :
> > > line 1, column 2 : -∞  esc-esc-tab   0   esc-esc-tab   1   esc-esc-tab
> > +∞
> > > line 2, column 2 :   esc-esc-+   0   esc-esc-–  0   esc-esc-+
> > > line 3, column 2 :  _-∞ esc-esc-/   ^0   esc-esc-–   _-1   esc-esc-+  ^+∞
> > > that remains artisanal, but artisanal is better than impossible
> > >
> > > what do you think about that ?
> > >
> > > Vincent
> >