Find params that minimize function
9 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Nicola Caldognetto
le 12 Avr 2020
Commenté : Nicola Caldognetto
le 13 Avr 2020
I have the function
where I know the , and σ
How can I find the two params x and y that minimize the function which variable is ξ ?
1 commentaire
Réponse acceptée
Thiago Henrique Gomes Lobato
le 12 Avr 2020
Modifié(e) : Thiago Henrique Gomes Lobato
le 12 Avr 2020
e = 5;
xi = [1,2,3,4];
yi = [3,4,5,6];
sigma = 2
fun = @(x,e,xi,yi,sigma) abs(4*e- sum(sqrt( (x(1)-xi).^2-(x(2)-yi).^2 ))/(2*sigma^2));
x0 = [1,1];
[x,fval] = fminsearch(@(x)fun(x,e,xi,yi,sigma),x0)
I changed your function with an abs() function, which I believe it was your intention, otherwise your function has no minimum since it can go to -inf.
3 commentaires
Thiago Henrique Gomes Lobato
le 12 Avr 2020
I just added random values to all variables to get a result. From your question I understood that you want to find the x and y that minimizes your function for a given e. If you want also to minimize e you can add it to the optimization function as a parameter, although the resulting function will have infinite local minima.
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Solver Outputs and Iterative Display dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!