output history and testing convergence

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Bran
Bran 2013-6-27
Hi there,
I have quite a complicated algorithm running and I would like to test to see if it converges as it is taking a very long time to run. How do I go about using my output from my while loops on each iteration, putting them into a graph so I can see if they converge??

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Matt J
Matt J 2013-6-27
编辑：Matt J 2013-6-27
x=nan(1,MaxIterations);
while i<=MaxIterations
...
x(i)=...
plot(x), drawnow
i=i+1
end
However, it's debatable whether this can give you true information about convergence, if you don't know what x(i) is converging to.
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Bran
Bran 2013-6-27
Oh unfortunately my information is 3D and so plot wont work!
Matt J
Matt J 2013-6-27
编辑：Matt J 2013-6-27
instead I need to see that the values between iterations are converging as my loop will stop once the matrices between consecutive iterations fail to differ by more than 0.1%
OK, so as an example, the sequence log(i), i=1,..., will show decreasing percent differences between log(i) and log(i+1) that eventually converge to zero. But you don't care that log(i) ---> inf ?
Oh unfortunately my information is 3D and so plot wont work!
Consider PLOT3, SCATTER3, or any of the various 3D plotting commands.

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