Writing a 'while loop'

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Taylor
Taylor 2013-1-29
Hello, I am trying to write a while loop and I want it to keep iterating until the answer converges to within 1.e-4 of the previous iteration. Every time I run this code, it only iterates it once. How would I go about fixing my first line so that it keeps running until the difference between the last two iterations is less than or equal to 1.3-4?
while (error>=1.e-4);%%This is where I am getting confused
iteration=iteration+1;
phi(:,iteration)=D\(rho-T*phi(:,iteration-1));
error=norm(phi(:,iteration)-phi(:,iteration-1),Inf);
end
Thank you in advance for you help.

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-1-29
编辑：Azzi Abdelmalek 2013-1-29
Initialize error to 1 for example
error=1
while (error>=1.e-4)
%your code
end
  1 个评论
Jan
Jan 2013-1-30
No, do not use "error" as a variable, because this shadows a very important Matlab function. I assume that the OP does have problems with this already, therefore avoiding such shadowing is strongly recommended.

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