Error when using distributive property

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D G 2011-7-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/12454-error-when-using-distributive-property

Hello!

The function below compares the output of two functions which run the same calculation. However, in one function the calculation's multiplications are distributed. It should output a matrix of 1s. However, it doesn't!

What's up with that?

function errorTest()
      compute(1:100) == distributed(1:100)
      function out = compute(a)
          out = 10.1 * (a - 1);
      end
      function out = distributed(a)
          out = 10.1 * a - 10.1;
      end
  end

Thanks!

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采纳的回答

Oleg Komarov 2011-7-26

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https://ww2.mathworks.cn/matlabcentral/answers/12454-error-when-using-distributive-property#answer_17021

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The propagation of floating approximations is different:

idx = abs(compute(1:100) - distributed(1:100)) > 2*eps
nnz(idx)

How many values over 2eps?

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D G 2011-7-26

I guess I had that backwards. If you remove the 2*, a lot of the answers are still different.

Oleg Komarov 2011-7-26

Cannot really help you more than that, I don't have experience with distributed server.

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