Hi all :how to save some new variables to different mat file

I have a code written to create some variables. At the beginning of the code, it loads the file "ws0722.mat" file. because of the "ws0722.mat" contains some variables which are used inside the new code to create new variables. how can I only save the new variables to new mat file, save function doesn't work for me as I have more (> 15) variables to name e:g save ('ws0722_B','s','a') if anybody can help,much appreciated Thanks

[Stephen23]

Why not just avoid the whole problem by load-ing into a structure?

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[Duminda Vidana Gamage]

Hi Stephen: Thanks.I loaded into the structure and accessed the old variables. then saved the new variables into new mat file. it worked. Thanks.

Answer 1

[Walter Roberson]

Before the load, use

existing_names = {};
existing_names = who();

then do your load and so on.

When you are ready to save, do

new_names = setdiff(who(), existing_names);
save(('ws0722_B', new_names{:});

[Duminda Vidana Gamage]

Hi Walter: I tried the following code.

existing_names = {};
existing_names = who();
load (ws0722.mat);
new_names = setdiff(who(), existing_names);
save(('ws0722_B'), new_names{:});

however, it still gave me all the variables saved into 'ws0722_B ; anyway, thanks for the answer.

[Walter Roberson]

To save only names created after the load(), put the load first and then the two lines about existing_names. Later after you have created new variables that you want to save, do the new_names and save() code.