Loading mat files in matlab created from octave

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Adib Zaman 2014-7-3

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评论： Gordon Fox 2023-1-6

I have this .mat file created from octave, which contains structures. When I wanted to load the mat files from matlab, it shows an error. How to load these files?

>> y = load('murikhao.mat')
Error using load
Unable to read MAT-file murikhao.mat: not a binary MAT-file.
Try LOAD -ASCII to read as text.

adding '-ascii' parameter didnt help.

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Robert 2014-11-30

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Really late reply, but I came across this issue today and wanted to post the solution. Try using the option -mat7-binary in your octave save command.

save -mat7-binary 'filename' 'var1' 'var2'

I'm using R2014a on my osx host and octave 3.8.1 on a linux vm.

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Juan Martin Farias 2023-1-5

This worked perfectly for me too. I am using R2021b in Windows 10

Thanks!

Gordon Fox 2023-1-6

Fixed the problem for me too! I'm using R2020a.

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James Tursa 2014-7-3

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If MATLAB can't load it, then I would guess that it was not written properly in Octave. Double check the way Octave is writing this file.

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Stephen23 2018-10-19

移动：Rik 2023-1-5

"Is this to suggest that MATLAB is somehow fundamentally incapable of reading octave text files?"

Not at all, I explained that Octave's proprietary text format is incompatible with MATLAB's optimized .mat operations, which I think is completely reasonable: TMW designed the .mat format, and those operators are designed to work with exactly that format.

Of course MATLAB's textfile importing tools can import the proprietary Octave text file format, and you could even write a little routine that parses the contents back into the correct variable classes (at least, as much as is reasonable for transferring data between two different applications that might support quite different classes, etc.).

"this is something that mathworks should fix"

To be honest this is very strange discussion. Consider that someone develops a spreadsheet tool (lets call it "Octcell") and decides to use the file extension .xls for their own Octcell mark-up text file: would we be surprised that Microsoft Excel does not handle the Octcell text files like its own binary .xls files, and throws an error? Who would we complain to: the Octcell designer who decided to use the already existing .xls file extension for a totally unrelated file format; to the Octcell users who don't read the documentation; or to Microsoft because of Octcell's incompatible textfile format? What happens when Octcell forks into one thousand derivative projects, each developing their own special textfile format... can all of those projects demand that Microsoft has to recognize their totally incompatible proprietary textfile formats as being exactly equivalent to its binary .xls files? Where does this end?

That sounds like a fun weekend project: write a word processor ("Octword") that saves its own special, essentially undocumented text file with a .doc file extension, upload Octword onto the web, and then complain to Microsoft that Word must be buggy because it does not load Octword's special .doc files. I wonder what their reply would be.

Walter Roberson 2018-10-20

移动：Rik 2023-1-5

Load the file in octave, save it in MATLAB binary format.

Walter Roberson 2018-10-20

移动：Rik 2023-1-5

Octave

Built-in Variable: default_save_format

This variable specifies the default format for the save command. It should have one of the following values: "ascii", "binary", float-binary, or "mat-binary". The initial default save format is Octave's text format.

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kkyaj 2018-10-20

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编辑：kkyaj 2018-10-20

The default_save_format in octave is a nice feature which I did know existed. Thanks, Walter. That is helpful.

I believe that we agree the solution to "how can i load octave *.mat files not written in mat-binary format into matlab?" is that matlab will not do this natively.

One needs to externally load/resave using octave (with '-mat7-binary' flag) or scipy (with io.loadmat, io.savemat), which is to say that there is no matlab solution to this.