MATLAB: Saving a logical mask

digital image processingimage processingImage Processing Toolboxlogical maskmatricesmatrixregion of interest

I have a code for creating a logical mask and calculating values inside the ROI of the mask. My query is: is it possible to save the logical mask to the desktop so that it can be applied to other data in the future?

Best Answer

Simply save it in a .mat file:

save('nameOfFile.mat','nameOfVariable')

and then load it back into memory:

S = load('nameOfFile.mat');
mask = S.nameOfVariable;

Use the relevant absolute/relative path to save it on the desktop.

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I suppose you only want to save a specific variable instead of everything:

If you would like to save only variable, a:

a = rand(1,10)
save('a_save.mat','a')

If you would like to save all variables:

filename = 'save_all.mat';
save(filename)

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"but it seems that it does not work properly"

It does exactly what the save documentation states for that option: "If a variable already exists in a MAT-file, then save overwrites it with the value in the workspace." The problem is not that the option does not work, the problem is that the option is very badly named and some users do not read the documentation. It should be called "replace", or "overwrite", or something similar.

To append new data to the end of a variable in a .mat file you will have to load the variable, append the new data, and then save the variable again. Or use matfile.

Best Answer

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