Version 7 3 Mat File

Matlab s matfile objects enable users to access and change variables stored in version 7 3 mat files without loading the entire variable into memory.

Version 7 3 mat file. To identify or change the default mat file version access the mat files preferences. By default all save operations create version 7 mat files. Your matlab is r2010a which should be later than v7 3. There are third opensource implementations of v7 3 mat file available so porting this to octave shouldn t require redo this from scratch.

In order to save your data to a mat file with version 7 3 or later specify the v7 3 flag as the version input argument. In this case the default mat file version is 7 3. Beginning at release 7 3 of matlab mat files are actually saved using the hdf5 format by default except if you use the vx flag at save time see help save in matlab. Version when creating a mat file set this field to0x0100.

The save variables to version 7 3 mat file example on that page shows the exact syntax. Matlab 7 1 r14sp3 1 5 0 september 1 2005 first 64 bit version available for windows xp 64 bit matlab 7 2 r2006a 15 1 5 0 2006 march 1 2006 matlab 7 3 r2006b 16 1 5 0 september 1 2006 hdf5 based mat file support matlab 7 4 r2007a 17 1 5 0 07 2007 march 1 2007. By default all save operations create version 7 mat files. Up through version 7 mat files individual variables are limited to 2gb in size.

The only exception to this is when you create new mat files using the matfile function. Also given that the v7 3 mat file is matlab s default and the only one option in matlab that can cope with variables larger than 2gb which is not that much nowadays we some octave users feel that it would be nice if developers could prioritize this. Endian indicator contains the two characters m and i written to the mat file in this order as a 16 bit value. The only exception to this is when you create new mat files using the matfile function.

If when read from the mat file as a 16 bit value the characters appear in reversed order im rather than mi it indicates that the program reading the mat file must. If you look at the help of save v7 3 means version 7 0 features plus support for data items greater than or equal to 2gb on 64 bit systems which should be in your advantage. Reading matlab structures in mat files does not seem supported at this point. Version 7 3 removes this restriction allowing variables to be arbitrarily large.

March 7 2005 support for memory mapped files.