Unreadable UTF characters when they are loaded in MATLAB R2022b, but they could be readable in R2020b

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国强
国强 2024-11-12
评论： 国强 2024-11-12
The table data are Chinese characters and saved in MAT-file by using MATLAB R2020b as attachment. In R2022b, MATLAB can load the table variable (db_Indicators), but the non-ASCII part of data in the table are unreadable.
Unzipped the attachment, and then running In MATLAB R2022b as following
load('database.mat','db_Indicators')
double(db_Indicators.UniNum{1})
It produces as
ans =
65533 49 46 49
In MATLAB R2020b, however,
It could be correctly displayed as
ans =
8470 49 46 49
Please help to correct the problem. Greatly thanks!

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Bruno Luong
Bruno Luong 2024-11-12
编辑：Bruno Luong 2024-11-12
It sounds like it related to the bug fix they carried out in 2021b, see @Stefanie Schwarz answer here; This breaks the encioding/decofing compatibility before and after this release.
  1 个评论
国强
国强 2024-11-12
Thanks. The clues here hint of the goodness in coding behaviour. I previously drag the variable (db_Indicators) in the workspace window and drop it into the MAT-file. It seems the bad habit to make the data unreadable and being lost by loading in the updated MATLAB R2022b. If using the save command as
save('database.mat','db_Indicators','-append')
the MAT-file would be free of the messy data in later MATLAB.
Maybe, MATHWORK should give some warning of data vulnerability when users save the non-ASCII data in MAT-file by dragging & dropping.

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