Problem with Upper Hessenberg Reduction
14 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Hello. I'm having trouble with the algorithm of the reduction to the Upper Hessenberg form through Householder reflections. Here it's what I have so far:
function [Q,H]=Hessenbergsup(A,p)
[m,n]=size(A)
Q=eye(n)
if m!=n
disp("A isn't a square matrix")
else
if p==1 # Householder Reflections
H=A
for k=1:(n-2)
x=H((k+1):n,k)
u=((sign(x(1)))*(norm(x,2))*eye((n-k),k)) + x
u=u/((norm(u,2))^2)
H(k+1:n,k:n)=H(k+1:n,k:n)-2*u*((u')*(H(k+1:n,k:n)))
H(1:n,(k+1):n)=H(1:n,(k+1):n)-2*((H(1:n,(k+1):n))*u)*(u')
Q(1:n,(k+1):n)=Q(1:n,(k+1):n)-2*((Q(1:n,(k+1):n))*u)*(u')
endfor
endif
if p==2 # Arnoldi Iterations (not done yet)
endif
endif
end
The thing is, the function works, but it doesn't give me the Upper Hessenberg form.
1 Kommentar
hemanth vemuluri
am 9 Jan. 2021
@Daniela Valdés I'm having the same problem, if you found the solution please do post it here.
Antworten (0)
Siehe auch
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!