I not able to understand what type error I am making in the while loop

Question

Manav Divekar 2021-11-4

0
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评论： Rik 2021-11-6

I want to use babyloniansqrt to work if Error value should be grater than threshold and this will update the x and E value, using xnext = (x+S./x)/2, E = abs(S-xnext.^2) formula. Please check my code and let me know what I am doing wrong

function out = babyloniansqrt(S,threshold)
x = 1;
if ~exist('threshold','var')
	threshold = 0.00001;
end
E = abs(S-x.^2);
while ~(E<threshold)
	xnext = (x+S./x)/2;
	E = abs(S-xnext.^2);
end

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Answer 1

Rik 2021-11-4

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https://ww2.mathworks.cn/matlabcentral/answers/1579168-i-not-able-to-understand-what-type-error-i-am-making-in-the-while-loop#answer_823844

编辑：Rik 2021-11-6

在 MATLAB Online 中打开

You aren't updating the value itself, so the calculation is the exact same on every iteration.

function out = babyloniansqrt(S,threshold)
%Write lead line here
%
% write usage instructions and explanation here
x = 1;
if nargin<2
    %set default threshold if not provided
	threshold = 10^-5;
end
E = inf; %set initial value to enter the loop
while E>threshold
	x = (x+S./x)/2;
	E = abs(S-x.^2);
end
out=x;
end