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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