How to compare previous results in iteration?

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ASHA PON 2023-1-22

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评论： ASHA PON 2023-1-24

I have a program with for loop having 1to 500. I need to compare the output of previous and current iteration, if the outputs are matching the program has to stop. Otherwise the loop has to continue till the match is achieved.

For example:

for i=1 to 500

[Some mathematical calcultion]

output= 109;

end

Expected output:

iteration has to stop when output [i] = output [i-1]

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回答（1 个）

Torsten 2023-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/1898465-how-to-compare-previous-results-in-iteration#answer_1153795

编辑：Torsten 2023-1-22

在 MATLAB Online 中打开

You should never check whether two variables are equal. Always check whether they are approximately equal:

difference = 1.0;
output_old = 0.0;
tolerance = 1e-6;
while difference > tolerance
  [Some mathematical calculations]
  output = ...;
  difference = abs(output_old-output);
  output_old = output;
end

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Torsten 2023-1-22

编辑：Torsten 2023-1-22

MATLAB does not have "integer" as data type. And I don't know how "output" is calculated in your code. So you should keep the code above as is. It will also work for integer values of "output".

ASHA PON 2023-1-24