very simple convergence problem during solving a equation! plz help!

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Hossein sadri
Hossein sadri 2012-6-13
im trying to solve a equation (which is in the form det(A)=0) using iterative loop for two unknown variables. The program acts very well but my problem is that i want to get the diagram which can converge to its real value infinitively but my program has a very low resolution and after steps it reaches its value and i have a direct line at the end of diagram. I have tried to improve the iterative steps but i didnt gain what i want.
can anybody help me improving the resolution?
[Merged information from duplicate posting]
im trying to solve a equation using the iterative loop! it works good but at the end it stops converging after some steps! how can i push it forward to continue with the converging? how can i increase the resolution? i have decrease the steps but didnt get a better result! please help me!
  1 个评论
Kye Taylor
Kye Taylor 2012-6-13
Love convergence problems... especially contractions (which it seems like you're dealing with)... can you include some code that generates the figure you're describing? Can you also give the specific equation?

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Hossein sadri
Hossein sadri 2012-6-13
its actually too complicated if i want to post the whole code, but the main structure is the following:
frequenceindex=1;
for frequence=10e3:e3:1000e3
S=[a b];
start=det(S);
kindex=1;
for k=10:0.1:2000
S=[a b];
end=det(S);
if start*end < 0 & end-start > 0
kmatrix(frequenceindex,kindex)=k;
kindex=kindex+1;
end
frequenceindex=frequenceindex+1;
end
  1 个评论
Walter Roberson
Walter Roberson 2012-6-13
I take it you are updating "a" and/or "b" in the loop? And you are looking for det(S) to converge to 0? We might need to see how you update "a" and "b".
I notice that you are only recording places in which start is negative and end is positive, and not places in which start is positive and end is negative. Is there a reason for that?

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