Is there issue with .mat files in matlab R2018b?

Hello, I have some issue with mat file corrupted with matlab r2018. I did not have the issue before. Does someone have the same issue?

[Walter Roberson]

are the files on aa network drive ? possibly OneDrive?

[Alban du Puytison]

Hello Walter, no.

[Steven Lord]

I am not aware of a systemic issue with MAT-files in release R2018b.

Perhaps if you give us more information about the situation you're experiencing we may have a better idea of what's going on and potentially how to resolve the problem. Some bits of useful information would include:

• What operating system you're using
• What data did you try to save to the MAT-file or load from it? Normal numeric data, an object, etc.
• What function or product saved the data? Was the data saved by a third-party product that tried to create a MAT-file?
• A clear description of what happens when you try to save or load the file (error, warning, crash, different answer than you expected, etc.)
• The full text of any warning or error messages you received

[Alban du Puytison]

Hello,

I am using Matlab R2018b with windows 10 professionnel.

I have in a .m file a code using :

save (nom_fichier, 'carsimu','d','dmax','DRS',...)

I want to save in a file .mat different values.

Error in matlab is :

Error using AutomaticSimulationCalcul (line 508)

Can not write file C:\Users\STG\Desktop\ART_LTS_FUJ_Loop3\Results Simu\LMP1\[Auto Simu - Swept

Parameters] Results\1819R04_FUJ_Loop4_RRH_4.mat.

If I want to load this file in the workspace I have this error

Error using load

Unable to read MAT-file C:\Users\STG\Desktop\ART_LTS_FUJ_Loop3\Results Simu\LMP1\[Auto Simu -

Swept Parameters] Results\1819R04_FUJ_Loop4_RRH_4.mat. File might be corrupt.

I never have the issue with R2017b.

And with R2018b it works sometimes but I have often .mat files corrupted.

Thanks for your help.

[Guillaume]

The first error you show says that there is an error writing the file. I would assume that if that error occurs, no file is written at all. The second error would then of course occur, since there's no file to read.

What do you mean by corrupted?

• the file does exist, but reading it fails completely (nothing is read, matlab errors)
• the file does exist, but when read you get incorrect values (probably the worst case)
• the file does not exist

[Alban du Puytison]

there is an error when saving the .mat file but it is created.

So it exist. And when I want to load it, matlab says that it is corrupted

[Walter Roberson]

ran out of disk space .

[Alban du Puytison]

I still have 8Go of free disk space

[Walter Roberson]

What happens if put in a breakpoint there and manually save() to C:\Users\STG\Desktop\testsave.mat ? You could also try saving one variable at a time to see if one particular variable is triggering the problem.

[Guillaume]

If you indeed have only 8 GB of free disk space, then you can expect problems due to low disk space. The pagefile (swap space) on its own is over 8GB on my system.

The other possibility is that your hard disk is failing. The problem is clearly with disk IO if you get an error while writing the file.

[Alban du Puytison]

ok I will try agin with more disk space. Thanks

Answer 1

[Steven Lord]

Is this part of the error message exactly how it appears in the Command Window?

Can not write file C:\Users\STG\Desktop\ART_LTS_FUJ_Loop3\Results Simu\LMP1\[Auto Simu - Swept

Parameters] Results\1819R04_FUJ_Loop4_RRH_4.mat.

If so your directory path may include a newline character and that's not allowed according to this page on Microsoft's website. Compare S1 and S2 from the below example:

S1 = ['C:\Users\STG\Desktop\ART_LTS_FUJ_Loop3\Results Simu\LMP1\[Auto Simu - Swept', ...
    newline 'Parameters] Results\']
S2 = strrep(S1, newline, ' ')

Try replacing the newline character with a space (or nothing, using '') as I did when I created S2 and see if save accepts the file name created using that modified path.

[Alban du Puytison]

there is no new line, it just because of the copy and paste from the matlab consol