How do I save this loop output into an array?

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Edivaldo Bartolomeu
评论： Edivaldo Bartolomeu 2021-2-17
Hi everybody
I am having trouble saving the loop outputs from the variable ESTIMATE into an array.
The code is below:
%% Question 5: Saving Results from Iterative Equations in an Array
clear
clc
o_number = input('Enter the original number: ');
estimate = input('Enter the initial estimate: ');
error = abs(o_number - estimate^3);
iterations = 0;
while (error >= 1e-9)
estimate = 1/3*(2*estimate + o_number/estimate^2); % outputs to be saved in a 1-d array.
error = abs(o_number - estimate^3);
iterations = iterations + 1;
end

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采纳的回答

KALYAN ACHARJYA
KALYAN ACHARJYA 2021-2-17
编辑：KALYAN ACHARJYA 2021-2-17
Use as array
estimate=[];
o_number = input('Enter the original number: ');
estimate(1)= input('Enter the initial estimate: ');
error= abs(o_number - estimate^3);
iter=1;
while (error >= 1e-9)
estimate(iter+1) = 1/3*(2*estimate(iter) + o_number/estimate(iter)^2);
error= abs(o_number - estimate(iter+1)^3);
iter= iter + 1;
end
Note that here extact size of preallocation of the vectors are not possible, because no idea about number of iterations. In such case either you choose the huge array size and later crop the array based on last iter value.

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