cell part not saved using '-struct' option

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Yu Li 2019-5-21

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评论： Walter Roberson 2019-5-22

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Hi:

I have a structure variable 'ImaInfo' like below:

then I saved it into disk using '-struct' option, using command:

save('test.mat','-struct','ImaInfo')

but the variable data in the struction ('ImaInfo.data') is not saved in the 'test.mat' file, as shown below:

just want know if there is any mistake with my operation? or 'cell' type is not allow to save in '-struct' option?

Thanks!

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Yu Li 2019-5-21

编辑：Yu Li 2019-5-21

在 MATLAB Online 中打开

Hi Steven:

there is no warning.

below is the result of which -all save:

>> which -all save 
built-in (/apps/matlab/R2018b/toolbox/matlab/general/save)
save is a Java method                                                                                % com.mathworks.services.Prefs method
/apps/matlab/R2018b/toolbox/matlab/codetools/+matlab/+desktop/+editor/@Document/Document.m           % matlab.desktop.editor.Document method
save is a Java method                                                                                % com.mathworks.mde.editor.MatlabEditor method
save is a Java method                                                                                % com.mathworks.matlab.api.editor.Editor method
/apps/matlab/R2018b/toolbox/matlab/appdesigner/appdesigner/+appdesigner/+internal/+model/AppModel.m  % appdesigner.internal.model.AppModel method
/apps/matlab/R2018b/toolbox/matlab/winfun/@COM/save.m                                                % COM method
/apps/matlab/R2018b/toolbox/simulink/simulink/@slxPackager/save.p                                    % slxPackager method
/apps/matlab/R2018b/toolbox/sl3d/sl3d/@vrworld/save.m                                                % vrworld method

the data inside the 'ImaInfo.data' is 'unit8' matrix which obtained from 'imread':

Hi Walter:

the file is very large: ~700Mb.

Thanks!

Yu Li 2019-5-22

I tried the '-v7.3' option, yes, the parameter is successfully saved. but I have one more question:

the size of original file is: 778436Kb

the size of compressed file is: 778431Kb

the usage of '-v7.3' only reduced 5Kb of the disk size, do you think this weird?

Thansk!

Walter Roberson 2019-5-22

V7.3 is not a compression specification. V7.3 uses a completely different internal format for data that is able to hold large variables where the old format included size counters that were limited to 1 gigabytes.

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