I modified the code more than once and every time there was an error, can someone tell me where the problem is and how to solve it?
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function out = Crank_Niclson( D, u)
beta=0.5;
% where D = alpha * dt / dx^2
A=zeros(length(u),length(u));
B=u;
B(2:end-1)=B(2:end-1)*(1-2*(1-beta)*D);
for i=1:length(u)
%[I,J]=xxx(size,i);
I=i;
if i==1 ||i==length(u)
A(i,i)=1;
else
for j=1:length(u)
%[I1,J1]=xxx(size,j);
I1=j;
A(i,i)=1+2*beta*D;
if abs(I1-I) >1
A(i,j)=0;
elseif I1-I==+1
B(i)=B(i)+(1-beta)*D*u(j);
A(i,j)=-beta*D;
elseif I1-I==-1
B(i)=B(i)+(1-beta)*D*u(j);
A(i,j)=-beta*D;
end
end
end
end
out = (A\B')';
end
1 个评论
Mathieu NOE
2022-5-11
hello
you have to post a fully working code and not only the function so we can better help you
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