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I'm trying to export a string to a Matlab mat file. Is it possible? The straightforward way

Export["file.mat", {{"1"}}, {{"Data"}}]

with any number of surrounding braces does not work for me, as I get the error message

Export::type: ({"1"}) cannot be exported to the ("MAT")format.

Any clues?

Edit

To make this a little clearer: I'd like to save some matrices and a string to the same MAT file.

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Could you perhaps describe the MAT format for those of us unfamiliar with it? –  Mr.Wizard Aug 2 '12 at 15:43
    
@Mr.Wizard Unfortunately I can't. It's a binary fileformat used by Matlab. The Mathematica doc says that the "Data" element can store "numerical or textual data given as a multidimensional array". But I don't know how. –  sebhofer Aug 3 '12 at 8:29

1 Answer 1

up vote 1 down vote accepted

I'm afraid Mathematica may not support this natively. In the documentation for .MAT:

Export["file.mat",expr] exports any numeric array to a MAT-file.

Export["file.mat",expr] creates a MAT-file from an array of integers or doubles.

While the documentation claims that:

Import fully supports MAT Level 4 and 5 files.

It makes no such claim for Export, stately only:

Export generates MAT 4 files.


For reference the binary MAT format is described in this PDF file. It says that level 4 MAT files may contain one or more matrices, but each one may only contain a single data type.

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Thanks for digging that up! It didn't think of looking up the MAT specification for the different versions, I just saw that it is possible to store strings with my version of Matlab. –  sebhofer Aug 7 '12 at 11:37

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