How do I rename variables from workspace for multiple matfiles?

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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!

Accepted Answer

Les Beckham
Les Beckham on 24 Mar 2022
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
  1 Comment
KuanTing Wu
KuanTing Wu on 25 Mar 2022
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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More Answers (1)

Rik
Rik on 25 Mar 2022
Edited: Rik on 12 Jul 2023
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
I will leave it as an excersize to you to write comments and documentation for this function.
  4 Comments
Belén
Belén on 11 Jul 2023
There seems to be a typo, it should be:
fn=fieldnames(Sin);

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