how to solve the error? Error in fixed_point_3 (line 10) while iter <= max_iter

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SARMILADEVI BHASKARAN 2020-12-13

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https://ww2.mathworks.cn/matlabcentral/answers/692665-how-to-solve-the-error-error-in-fixed_point_3-line-10-while-iter-max_iter

评论： Walter Roberson 2020-12-13

function [x] = fixed_point_3(init,error,max_iter)
% 2x^3 + 4x^2 - 10 = 0 can be written as
% 4x^2 = 10 - 2x^3 --> x^2 = 1/4 *(10 - 2x^3)
% if only positive root is taken, then x = 1/4 ((10 - 2x^3)^(1/2)
%now we can use fixed point iteration
iter = 0;
now
%max_iter = maxium number of iterations
while iter <= max_iter
    max_iter = 7.3814e+05;
x = (1/4)*((10- init^3)^(1/2));
iter = iter + 1;
if abs(x-init)<error
return
end
end  

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Matt Gaidica 2020-12-13

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I don't get an error passing in (1,1,1). Note: it's bad practice to use init and error as variable names, those are reserved in MATLAB. Also, use a code block to share.

function [x] = fixed_point_3(init,error,max_iter)
% 2x^3 + 4x^2 - 10 = 0 can be written as
% 4x^2 = 10 - 2x^3 --> x^2 = 1/4 *(10 - 2x^3)
% if only positive root is taken, then x = 1/4 ((10 - 2x^3)^(1/2)
%now we can use fixed point iteration
iter = 0;
now
%max_iter = maxium number of iterations
while iter <= max_iter
    max_iter = 7.3814e+05;
    x = (1/4)*((10- init^3)^(1/2));
    iter = iter + 1;
    if abs(x-init)<error
        return
    end
end