an error in new versions? triognometric function of A*t
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Dingyu Xue
le 17 Août 2017
Commenté : Dingyu Xue
le 25 Août 2017
Please run the following code in MATLAB R2017a
A1=simplify(A1), A2=simplify(A2)
A=[-7,2,0,-1; 1,-4,2,1; 2,-1,-6,-1; -1,-1,0,-4];
syms t, A1=(expm(A*1j*t)-expm(-A*1j*t))/(2*1j);
A2=(expm(A*1j*t)+expm(-A*1j*t))/2;
The results are different from the ones in earlier versions such as R2008a, R2011a. The results in earlier versions are consistent with the commands funm(A*t,'sin'). Obviously the results in the new versions are wrong, or at least not simplified well.
0 commentaires
Réponse acceptée
Stefan Wehmeier
le 25 Août 2017
It is a matter of taste if you prefer results in terms of exp or sin. You could do
simplify(rewrite(A1, 'sin'))
Plus de réponses (0)
Voir également
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!