Here simple code keeps freezing my matlab, guess why?

Question

Joon Jeon 2012-3-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/32882-here-simple-code-keeps-freezing-my-matlab-guess-why

Hi, the following code keeps my matlab freezed(busy). And it never get solved!

y=[9048;4807;3393;2686;2262;1980;1778;1626;1508];
z=[22187;11787;8321;6587;5547;4854;4359;3988;3699];
beta=0.985^2;
alpha=0.3;
gamma=0.03;
phi=roundn([2.077869902373392 2.560745705954086], -3);
R=3026;
syms x;
eval=zeros(2,9);
for i=1:9
[eval(:,i)]=solve(gamma/(R-(1+phi(1)*x)*(1+phi(2)))-z(i)-((1+alpha*beta)/beta*(gamma/x-y(i))), x);
end

Saying code is not that correct in Loop.

But, even after removing loop and plugging just y(1) and z(1) doesn't work.

Do you know the reason? Is it memory problem? or any suggestion, please?

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Alexander 2012-3-20

Which version of MATLAB are you using? My MATLAB returns the following result after less than one second:

eval =

408.4511 408.4511 408.4511 408.4511 408.4511 408.4511 408.4511 408.4511 408.4511

-0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000 -0.0000

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Answer 1

Daniel Shub 2012-3-20

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https://ww2.mathworks.cn/matlabcentral/answers/32882-here-simple-code-keeps-freezing-my-matlab-guess-why#answer_41452

It runs just fine for me if I remove the roundn call (as I don't have that function/toolbox/version).

Given your propensity to use builtin functions as variable names (beta, alpha, gamma, and eval), have you overwritten something else that is important (e.g., solve, syms, times).