Calculate with initial value

Question

Jamil Arif 2021-5-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/830918-calculate-with-initial-value

编辑： per isakson 2021-6-2

i=1;
Z(i)=1;
while true 
    Z(i) =1 + B - q.*B.*(((Z(i))-B)./(((Z(i))-B*sigma)*((Z(i))+epsi*B)))-Z(i); 
    i=i+1;
end

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Sulaymon Eshkabilov 2021-5-15

Note that in your set up "while" loop, Z(i) can't be on both sides of the equal sign. Z(i) on the left side has to be Z(i+1).

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Answer 1

per isakson 2021-5-16

1
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https://ww2.mathworks.cn/matlabcentral/answers/830918-calculate-with-initial-value#answer_700683

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There is nothing that terminates the execution of the loop when convergence is reached. Thus, the while-loop will run until the vector, Z, exceeds "Maximum possible array" or something else throws an error.

i=1;
Z(i)=1;
while true
    Z(i+1) = 1 + B - q.*B.*(((Z(i))-B)./(((Z(i))-B*sigma)*((Z(i))+epsi*B)));
    i = i+1;
end

Replace the loop by

tol = 1e-6;
i = 2;
Z(i)   = 1;
Z(i-1) = Z(i)+2*tol;
while abs(Z(i)-Z(i-1)) >= tol
    Z(i+1) = 1 + B - q.*B.*(((Z(i))-B)./(((Z(i))-B*sigma)*((Z(i))+epsi*B)));
    i = i+1;
end