How to increase maximum number of iterations in a 'for' loop, when in the loop?
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Kaushal Sorte
el 20 de Nov. de 2020
Comentada: Steven Lord
el 20 de Nov. de 2020
A = [9 1 2 3; 1 7 2 3; 1 5 10 2; 1 2 3 9]
B = [1;2;3;4]
n = size(B,1);
Tolerance = 10^-15;
x = zeros([n,1]); %Initialization vector defaultly set as zero for ease of operation.
Norm_Values = []; % Storing first norm values.
K = 10;
for k = 1:K
T = x; % Storing previous x vector
for i = 1:n
x(i) = (B(i) - A(i,[1:i-1 i+1:n])*x([1:i-1 i+1:n]))/A(i,i);
end
if (norm((x-T),1) < Tolerance) % Checking for convergence.
fprintf('GaussSeidel has converged in %d iterations.\n',k)
break
elseif (k == K)
K = K + 10 %Extending for loop
end
end
Could somebody please help me with this problem?
If the norm does not go below tolerance within K iterations, I want to increase the number of iterations. But it is not working. It is only going up to 10 iterations.
(Above is just parts of the whole code.)
I don't want to use 'while' here because I would then have to do the 1st iteration outside the loop.
Help will be appreiciated.
Thanks in anticipation.
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Respuesta aceptada
Alan Stevens
el 20 de Nov. de 2020
Use a while loop instead
while (norm((x-T),1) > Tolerance)
...etc
end
6 comentarios
Rik
el 20 de Nov. de 2020
It might be possible, but you should not do that. If you don't know the iterator values in advance, you should use a while loop.
You can also use the higher number of iterations and use break inside an if statement, but that will not work for your setup.
Steven Lord
el 20 de Nov. de 2020
No. As soon as you enter the for loop, MATLAB calculates the values of the loop variable over which it iterates. You can (but shouldn't) change the loop variable inside the body, but any such changes will be overwritten with the next iterate at the start of the next execution of the body of the loop.
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