How do I rename variables from workspace for multiple matfiles?

Question

KuanTing Wu 2022-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/1679709-how-do-i-rename-variables-from-workspace-for-multiple-matfiles

评论： Rik 2023-7-12

采纳的回答： Les Beckham

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Hello there! I am trying renaming those variables, e.g., 'img' to 'img_ldct' and 'lab' to 'lab_ldct', and making these two matfiles' variable names become same.

img_ldct=img;
clear('img')

I have tried the above code and it worked, but the new variable name did not saved in matfiles,which meant when I clicked the workspace later, the variable name was still 'img', not 'img_ldct'. How can I change variable names correctly? Also, is it possible to rename multiple matfiles automatically with the same name-changing rule, e.g., adding '_ldct' after original variable names?

Please suggest and thank you for helping!

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Answer 1

Les Beckham 2022-3-24

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https://ww2.mathworks.cn/matlabcentral/answers/1679709-how-do-i-rename-variables-from-workspace-for-multiple-matfiles#answer_926059

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clearvars
load('filename.mat') % load data that you want to change (replace filename with actual name of your file)
img_ldct=img;        % do the rename
clear('img')
save('matfile1.mat') % save the result with the change
% repeat for any other mat files that you want to make changes to 

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KuanTing Wu 2022-3-25

Thank you! I really appreciate your suggestion and it works! May I ask how should I use a loop to rename multiple matfiles automatically with the same name-changing rule, e.g., adding '_ldct' after original variable names?

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Answer 2

Rik 2022-3-25

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https://ww2.mathworks.cn/matlabcentral/answers/1679709-how-do-i-rename-variables-from-workspace-for-multiple-matfiles#answer_926664

编辑：Rik 2023-7-12

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With the syntax Les posted it is not possible to apply this to multiple mat files and variables automatically, which is one of the reasons to load to a struct instead. That way it is obvious where variables are coming from and you can use fieldnames to get all the variable names.

rename_variables('filename.mat','_ldct')
function rename_variables(filename,suffix)
Sin=load(filename);
Sout=struct;
fn=fieldnames(Sin);
for n=1:numel(fn)
    Sout.([fn{n} suffix])=Sin.(fn{n});
end
save(filename,'-struct','Sout')
end