how to save a string as a filename?

Hi, How to save a file "with the characters of a string" as the file name? For example, I have a piece of code, which generates a sting output "case study_# " and the number (#) changes each time I feed in different inputs. I want the name of the output file to be saved, based on the string output. Thanks, Subrat

Answer 1

[Thomas]

Maybe something like this

for number=1:10
    file_name = sprintf('case study_#%d.txt',number);
    save(file_name,...);
end

[Amir Pasha Zamani]

It doesn´t work for me

My code is something like this:

for Animal=1:N
    Data  = {rand(2,2) ; rand(3,3)};
    file_name = ['Animal_' , num2str(Animal)];
    save (file_name , Data)
end

But when I run it, I get the error:

Error using save
Argument must contain a character vector.

:(

Can anyone help please?

Answer 2

[Jan]

This is an evergreen question, See FAQ: How to process files in a loop.

It is strongly recommended to read the other frequently asked questions also. It is worth to profit from the problems others had already.

Answer 3

[Albert Yam]

for i=1:2; 
    save(['test_' num2str(i)]);
end

[Albert Yam]

I'm quoting your response, in case it can help someone else.

For example, if the name of the sting is 'a' and it generates the output as "case_study_test_simulation" 
a = case_study_test_simulation;  
then I expect the saved file to have the file name as "case_study_test_simulation.mat." Instead, I end up getting the file name as "a.mat."

From what I understand (I'm writing it out as 'I' would read it), you have a variable 'a' that contains a string 'case_study_test_simulation' (as opposed to string string a). so

a = 'case_study_test_simulation';  %note the quotes
save(a) %this will produce what you are asking for 
        %'case_study_test_simulation.mat
save('a') %will produce a.mat

This is because Matlab reads string 'a', not variable 'a' (that contains string 'case_study_test_simulation'