pm_hash - have values changed in recent version of Matlab?

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Steve Van Hooser 2019-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/496132-pm_hash-have-values-changed-in-recent-version-of-matlab

回答： Steve Van Hooser 2022-2-6

I sometimes use pm_hash to compute hash numbers across Matlab platforms AND across Matlab versions. For many years, this worked great.

However, I recently updated to Matlab 2019a, and I just noticed that the pm_hash('crc',X) values that are computed for a Matlab variable X are now changed.

Does anyone know when the change occurred? Probably this was later than Matlab 2017a, but I no longer have those versions installed. Have others found that this has changed also? Is this a bug or intentional?

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Guillaume 2019-12-11

Is pm_hash a matlab function? It's certainly not part of base matlab and a search for it doesn't return much.

Steve Van Hooser 2019-12-11

No, it is presently part of the SimScape toolbox. On my system:

built-in (/Applications/MATLAB_R2019a.app/toolbox/physmod/common/foundation/mli/m/pm_hash)

However, it has been really useful because it can accept a variable of any type. If I have a custom data type and a variable A of that type, I can call:

hash = pm_hash('crc',A)

and it returns a uint32 hash string based on its data.

Best

Steve

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Answer 1

Steve Van Hooser 2022-2-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496132-pm_hash-have-values-changed-in-recent-version-of-matlab#answer_890140

This does not answer the question as to whether the pm_hash has changed, but there is a decent replacement for pm_hash (which does not require Simulink/Simscape) is described here:

https://undocumentedmatlab.com/articles/serializing-deserializing-matlab-data

followed by https://www.mathworks.com/matlabcentral/fileexchange/31272-datahash

Best

Steve