Le forum de XCAS

Cours du 4 décembre: Introduction au calcul variationnel: Lagrangien L(x,x',t) (attention j'ai noté x point en cours, pas x' mais sur ce forum je ne sais pas faire un x point...), action S, exemple: chemin le plus court en dimension 2, lagrangien de la mécanique classique dans le cas de forces conse...

27 nov 2025: cours 12 sur 13 Comportement des solutions d'un syst linéaire à coeffs constants et matrice A diagonalisable lorsque t->+infini: Illustration machine de l'allure des courbes solutions en dimension 2 Notation exp(A*t), Y(t)=exp(A*t)*Y(0), justification Cas général homogène: si les valeur...

There is a port of Xcas in a Numworks calculator simulator, based on Upsilon and KhiCAS, it's name is CASworks:
https://www-fourier.univ-grenoble-alpes ... casen.html

Cours du 20 novembre (11 sur 13) Comportement des solutions d'équations autonomes y'=f(y): équilibre si f(r)=0, y=r, stable si f passe de positif à négatif en y=r, instable dans le cas contraire. Si f'(r)<0 stable, si f'(r)>0 instable. Exemple y'=y0^4-y^4 (cf. l'exam de janvier 2023) Le linéarisé de...

I don't see why you think it's simpler to have some optional arguments to solve. For me it's the contrary, it's better to have a universal way to rewrite the result of a command by nesting the command inside a rewriting command.

Unfortunately, | and subst do not follow the same evaluation rules. Modifying | to mimic subst would certainly break some code...

I don't think it's a good idea to change the format of the answer, think of someone who is using solve in a program.

What about using subst?

It may be related to an issue with FLTK (not enough stack space to save fl_clip).
https://www.fltk.org/newsgroups.php?gfl ... it+v:17735

Cours 10 sur 13 (13/11) Recherche de solutions particulières pour les EDO linéaires à coefficients constants avec second membre/ Principe de superposition. Conjugué d'une solution particulière lorsque les coefficients sont réels. Application au calcul de solution particulière pour un second membre t...

It already does :
solve([[1,1,-1],[1,-1,-1],[1,-1,1],[1,1,1]]*[[α1],[α2],[α3]] = [[2],[1],[2],[3]],[α1,α2,α3],'=')

Make sure you are running the "pure" Xcas interpreter, not the Python-compatible mode, to get = for = in text outputs.

You have 4 equations for 3 unknowns, it's not really surprising that there is no solution...

Indeed. Should be fixed now.

The ujf-grenoble.fr domain is not supported anymore, instead use
https://www-fourier.univ-grenoble-alpes ... /xcas.html