MATLAB: Resave a Matlab file with v7.3 option

Question

Hello,

I have few huge files with many substructures inside. I need to partially modify the content. I'm using matfile with option "'Writable',true".

I'm getting a lot of errors because although the total file is less than 2Gb, apparently once uncompressed some array is over 2 GB:

"Warning: The file 'D:\work\capture_tool\dsp\ctt_platform\input\rawdata_toronto55_matrix7x5_70g_50taps.mat' was saved in a format that does not support partial loading. Temporarily loading variable 'Push'

into memory. To use partial loading efficiently, save MAT-files with the -v7.3 flag.

Warning: Variable 'Push' was not saved. For variables larger than 2GB use MAT-file version 7.3 or later. "

If i load and save, it adds another layer in the structure which is the name of the original variable i used to load. Therefore, my program can't access it again:

temp = load('orig.mat');

save('-v7.3','mod.mat','temp')

temp2 = load('mod.mat')

temp2 =

struct with fields:

temp: [1×1 struct]

How can i automatically resave the files with option v7.3 leaving the structure untouched?

Thanks

Riccardo

Answer 1

The version option goes at the end on save():

save('mod.mat','temp','-v7.3');

While loading,

temp2 = load('mod.mat');
temp2 = temp2.temp;