MATLAB: Renaming variable loaded from a file

varibles renaming

Hello, I have 4 .mat files including tens of variables of the same name. How I can rename the variables after loading each file in a new script file. I have read similar link but didn't work well.

Thanks

Best Answer

Use either the load or matfile functions with an output argument. The structure format can keep the variable names separate.

For instance, if you have variable names ‘x’, ‘y’, and ‘z’ in each .mat file, you can load them all into your workspace without ambiguity. If your .mat files are named A.mat and B.mat, load them as:

A = load('A.mat');
B = load('B.mat');

then:

A.x         % ‘x’ from A.mat
B.x         % ‘x’ from B.mat

and so forth for the rest of them. You have to refer to them as such in the rest of your code, but they will be uniquely identified that way.

Related Solutions

MATLAB: Question about load .mat files

If you are certain that there is no overlap in variables in all those files, then you can use

for i = 1:300
    load(['W_star_',num2str(i),'.mat'])
end

but if some of the variables overlap, you'll need to load them into separate structures, to ensure that later loads don't overwrite earlier ones.

for i = 1:300
    S{i} = load(['W_star_',num2str(i),'.mat'])
end

Then you'll need to extract the variables from the structures.

MATLAB: How can I save mat files into mat file

aLoad = load( 'a.mat' );
bLoad = load( 'b.mat' );
save( 'ab.mat', '-struct', 'aLoad' );
save( 'ab.mat', '-struct', 'bLoad', '-append' );

works. It's probably neater to merge the structs and do a single save, but I couldn't remember off the top of my head how to do that so if this is a one-time operation then that solution works fine.

Best Answer

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MATLAB: Question about load .mat files

MATLAB: How can I save mat files into mat file

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