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appending variables in save causing file corruption

Asked by Oliver Warlow on 29 Aug 2019
Latest activity Edited by Sai Bhargav Avula on 6 Nov 2019
Hi,
I have some .mat files containing several variables of type 'Table'. I perform some analysis and replace some of these variables using the command
save('FileName', {'VarX', 'VarY', etc}, 'mat', '-append')
In this case there are other variables in the file appart from VarX and VarY which I am not overwriting. this seems to work most of the time, but every now and again i get an error:
Error using save
Error closing file 'FileName'
The file may be corrupt.
The files I am dealing with are around 250-500MB in size.
Any ideas why this might happen? It means I then corrupt my original data which is annoying. Perhaps I am best to create a totally new file with the new data and then replace the old file, therefore if I do get a corrupt file when writing I won't have destroyed my original data.
Thanks
Oli.

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1 Answer

Answer by Sai Bhargav Avula on 6 Nov 2019
Edited by Sai Bhargav Avula on 6 Nov 2019

Hi,
One reason that the files get corrupted is because you might be trying to overwrite it before it could save the old process.
Also I would recommend you to use the matfile, as it can access and change the variables without loading it into the memory. Because of this the MAT file object requires less memory than the load and save commands.
Hope this helps!

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