Info
Cette question est clôturée. Rouvrir pour modifier ou répondre.
solve value in matrix form
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have a set of value, i'm trying to use matlab to calculate the value by set, however i cant get matlab to work with it with the code i generated.
this is the code i use, where c=[1 2 3 5], t=[5 9 7 6],
double( solve(c*(y*exp(-t/y)) ), y ) )
how cant i get y in a set of value?
1 commentaire
Walter Roberson
le 10 Mar 2013
Please read the guide to tags and retag this Question; see http://www.mathworks.co.uk/matlabcentral/answers/43073-a-guide-to-tags
Réponses (1)
Walter Roberson
le 10 Mar 2013
syms c t y
fun = matlabFunction( solve( c*(y*exp(-t/y)), y ), 'vars', {c t});
fun([1 2 3 5], [5 9 7 6])
2 commentaires
Walter Roberson
le 12 Mar 2013
exp(-t/y) is non-zero provided that -t/y is not -infinity.
y times a value is zero only if y is 0 or the value is 0.
So when is -t/y equal to -infinity? Never.
So for c * y*exp(-t/y) to be 0 with non-zero c, y must be 0, to get the y* part to be 0. But when it is, we have exp(-t/0) which is division by 0 which is undefined. And 0 times undefined is undefined.
Thus there is no value for which c * y * exp(-t/y) is 0 for finite non-zero c and t, so solve() must say that no solutions can be found.
Cette question est clôturée.
Voir également
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!