## maxima-lang-fr — French-language discussion of the Maxima computer algebra system

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 [Maxima-lang-fr] problème avec charpoly From: denis.thenail - 2009-12-15 21:53:31 ```Bonjour, je cherche le polynôme caractéristique d'une matrice (6,6). Cette matrice est pleine mais résulte d'un problème aux valeurs propres généralisé tridiagonal du type (K-omega^2M)(Phi)= (0) M définie postive, K semi-définie positive ramené sous la forme standard (M^{-1}K-omega^2I)(Phi)=(0) J'exécute avec Maxima : Ca5:matrix([153*Z/209,-194*Z/209,52*Z/209,-14*Z/209,4*Z/209,-X/209]); Ca5:addrow(Ca5,[-97*Z/209,179*Z/209,-104*Z/209,28*Z/209,-8*Z/209,2*X/209]); Ca5:addrow(Ca5,[26*Z/209,-104*Z/209,155*Z/209,-98*Z/209,28*Z/209,-7*Z/209]); Ca5:addrow(Ca5,[-7*Z/209,28*Z/209,-98*Z/209,155*Z/209,-104*Z/209,26*Z/209]); Ca5:addrow(Ca5,[2*Z/209,-8*Z/209,28*Z/209,-104*Z/209,179*Z/209,-97*Z/209]); Ca5:addrow(Ca5,[-Z/209,4*Z/209,-14*Z/209,52*Z/209,-194*Z/209,153*Z/209]); charpoly(Ca5,l); factor(%); expand(%); la commande charpoly entraîne : Universal error handler called recursively (:ERROR NIL MAXIMA::DIMNARY "" "Couldn't protect") Universal error handler called recursively (:ERROR NIL MAXIMA::DIMNARY "" "Couldn't protect") Maxima encountered a Lisp error: Error in MAXIMA::DIMNARY [or a callee]: Caught fatal error [memory may be damaged] Automatically continuing. To reenable the Lisp debugger set *debugger-hook* to nil. Merci de m'aider à améliorer ma pratique de MAXIMA, cordialement Dude007 ```

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