MATLAB: Differences between .mat versions

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Version 7.3 of MAT-files uses HDF5 format, this format has a significant storage overhead to describe the contents of the file, especially so for complex nested cellarrays and structures. Its main advantage over previous versions of MAT-files is that it allows storing data larger than 2GB on 64-bit systems.

Note that both v7 and v7.3 are compressed and use Unicode encoding (unlike v6), yet they are two completely different formats…

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