terminating the while if loop

Question

sermet 2017-7-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/348739-terminating-the-while-if-loop

编辑： Jan 2017-7-14

while abs(dE) > 1e-12
iteration=iteration+1;
E_old = E;
E = M+(ecc(1)*sin(E));  %eccentric anomaly
dE=E-E_old;
if iteration==1000
warndlg('iteration cannot be converged ', 'Error!', 'modal')
end
end

How can I modify above code to terminate the while loop when iteration exceeds 1000?

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Answer 1

Star Strider 2017-7-14

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https://ww2.mathworks.cn/matlabcentral/answers/348739-terminating-the-while-if-loop#answer_274157

编辑：Star Strider 2017-7-14

在 MATLAB Online 中打开

I would add a break or return in your if block:

if iteration>=1000
    warndlg('iteration cannot be converged ', 'Error!', 'modal')
    return
end

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sermet 2017-7-14

it doesn't terminate while loop because abs(dE) is always higher than 1e-12.

Star Strider 2017-7-14

在 MATLAB Online 中打开

change the if condition to:

if (iteration>=1000) || (abs(dE) < 1e-12)
    warndlg('iteration cannot be converged ', 'Error!', 'modal')
    return
end

That should work as you want it to.

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Answer 2

Jan 2017-7-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/348739-terminating-the-while-if-loop#answer_274168

编辑：Jan 2017-7-14

在 MATLAB Online 中打开

limit = 1000;
iter  = 0;
dE    = 1;
while abs(dE) > 1e-12 && iter < limit
  iter  = iter + 1;
  E_old = E;
  E     = M+(ecc(1)*sin(E));  %eccentric anomaly
  dE    = E-E_old;
end
if iter == limit
  warndlg('iteration cannot be converged ', 'Error!', 'modal')
end