32 bit vs 64 bit machine effect in computing equal code

Question

Alberto Vergani 2016-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/303484-32-bit-vs-64-bit-machine-effect-in-computing-equal-code

编辑： Stephen23 2016-9-22

32bit and 64bit Windows don't compute the same result for the same code written and run with Matlab 32bit. The difference I have noted are few in a large calculus, but they are present. Shortly, my computation has not been exactly replicate with both machine. Why? How to control this machine effect?

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Stephen23 2016-9-22

编辑：Stephen23 2016-9-22

This might be interesting as well:

https://www.mathworks.com/matlabcentral/answers/292072-does-the-matlab-version-affect-on-your-code-s-output

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Answer 1

Fei Deng 2016-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/303484-32-bit-vs-64-bit-machine-effect-in-computing-equal-code#answer_235700

Hi Alberto,

Some higher-level algorithms boiling down to basic arithmetic operations can result in different results, when they are performed in different environments due to the very nature of floating-point arithmetic.

I'd like to link this question to similar questions and answers here

http://www.mathworks.com/matlabcentral/answers/1032-why-do-some-calculations-like-the-fft-produce-different-results-when-performed-on-a-gpu

and here

https://www.mathworks.com/matlabcentral/answers/438-why-are-computational-results-in-matlab-sometimes-different-on-different-machines-and-how-can-i-prev