How to fix the error (Index exceeds matrix dimensions)?
조회 수: 1 (최근 30일)
이전 댓글 표시
could you please check my code. I got the following error
Index exceeds matrix dimensionshow .
Error in NnNonSymmetricLanczos (line 17)
r=A*V(:,j)-alpha*V(:,j)-gamma*V(:,j-1);
function [alpha,beta,gamma,T] = alg(A,v,n)
n=4;
c = ones(n,1);
t = ones(1,n)./(1:n);
A = toeplitz(c,t);
v = randn(n,1);
V=v; W=v/norm(v)^2;
beta=0; gamma=0;
alpha=W(:,1)'*A*V(:,1); T(1,1)=alpha;
for j=1:n
if j==1
r=A*V(:,j)-alpha*V(:,j);
p=A'*W(:,j)-alpha*W(:,j);
else
r=A*V(:,j)-alpha*V(:,j)-gamma*V(:,j-1);
p=A'*W(:,j)-alpha*W(:,j)-beta*W(:,j-1);
end
beta=norm(r);
gamma=r'*p/beta;
end
T(j+1,j)=beta;
T(j,j+1)=gamma;
V=[V,r/beta];
W=[W,p/gamma];
alpha=W(:,j+1)'*A*V(:,j+1);
T(j+1,j+1)=alpha;
end
댓글 수: 0
채택된 답변
Matt J
2019년 9월 19일
V and W only have a single column, but you are indexing them V(:,j) and W(:,j) at j>1.
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Matrix Indexing에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!