C++ .MAT file format

I have a C++ application that generates a lot of numerical matrices and vectors using C++ numerical libraries as Eigen and Blaze (and std::vector too)

I would like to store these results in a file that could be opened in MATLAB.

I saw that MATLAB have a C/C++ API that enable developers store numbers/strings in the *.mat file format.

Link here: https://www.mathworks.com/help/matlab/matlab_external/creating-a-mat-file-in-c.html

But in this MATLAB API my C++ matrices and vectors should be mxArray pointer.

How can I use this MATLAB API to store my Eigen and Blaze matrices?

[James Tursa]

Can you simply write the matrices out to a binary file and then use fread to get them into MATLAB?

[Nycholas Maia]

Hi @James Tursa,

Yes, I can do that, but my application will generate a lot os matrices and vectors as results.

I would like to retrive each one by a "name" or "id"...

Like "rotation_matrix", "time_vector"...etc...

And another thing:

I would like to get a specific matrix in this file without need to load all file data.

The HDF5 file format can do that and MATLAB have support to it, but I would like to know if there is a good and stable C++ API to help me.

Or if there is another file format that I can obtain these 2 features:

• Get matrix by name or path
• No need to load all file data to get some matrix