What means the resulting matError code 3 of matPutVariable()?

I am creating a huge mxArray which I want to write in a mat File. But I get an errorcode 3 while processing this method.

matPutVariable(mat_file, field_name, value);

Ive searched the MatLab help but couldnt findt more than

#define OVERFLOW 3
and 
LIBMAT_API_OFFERS_ERROR_ENUMS

Does anyone know where I can find informations about the retuning error codes?

Edit: I am working with Visual Studio 2013; C++; MatLab R2013b x64

[Primoz Ocepek]

I know this is old topic, but I'm having the same problem in Visual Studio 2016 and Matlab R2016a x64 bit version. Every help is appreciated. Thx in advance.

Answer 1

[Tim Sweet]

This error is returned when the variable to be added to the file is larger than 2^31 bytes. You can use use the output mode "w7.3" to write larger variables, but note that there are tradeoffs.

For example:

matOpen(filename, "w7.3");