Question

This happens when saving a large (300 MB) structure. (It’s a containers.Map with strings as keys and various large matrices as values.)

Error message:

Out Of Memory during serialization of the Subsystem Data
Error using save
Error closing file C:\a\comsol\fibre_bundle_AP.mat.

Error in process_data3/saveData (line 132)
        save(save_file, 'data');

Answer 1

As explained here, the save function in current versions of Matlab makes a copy of the structure that it is saving. This may cause Matlab to run out of memory.

One solution is to use an older version of save, as follows:

save(save_file, 'data', '-v7.3');

The above solves the problem for me.