Variable x must be of data type double. It is currently of type sym. Check where the variable is assigned a value.
18 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Jonas Freiheit
le 17 Sep 2020
Modifié(e) : Ameer Hamza
le 19 Sep 2020
Hello,
I was wondering how I could change my variable 'x' to type double from syms. I've tried converting it to type double with x=double(x) and nothing has happened.
Help would be very appreciated!
U = [3,2,1;
0,1,2;
0,0,1]
b = [0;0;0]
x=backsub(A,b)
function x = backsub_syms(U,b)
n = length(b);
syms t
x=sym(zeros(n,1))
x(n)=sym('t')
b=(sym(b))
for i = n:-1:1
x(i)=b(i);
x(n)=sym('t')
if i<n
for j = n:-1:i+1
x(i)=x(i)-U(i,j)*x(j);
end
end
x(i)=x(i)/U(i,i);
end
end
Thanks for the help much appreciated!
0 commentaires
Réponse acceptée
Ameer Hamza
le 19 Sep 2020
Modifié(e) : Ameer Hamza
le 19 Sep 2020
You need to substitute a value for symbolic variable t to get a numeric value
U = [3,2,1;
0,1,2;
0,0,1];
b = [0;0;0];
syms t;
x = backsub_syms(U,b);
y = subs(x, t, 1) % t = 1
double(y)
function x = backsub_syms(U,b)
n = length(b);
syms t
x=sym(zeros(n,1))
x(n)=sym('t')
b=(sym(b))
for i = n:-1:1
x(i)=b(i);
x(n)=sym('t')
if i<n
for j = n:-1:i+1
x(i)=x(i)-U(i,j)*x(j);
end
end
x(i)=x(i)/U(i,i);
end
end
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Number Theory dans Help Center et File Exchange
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!