Save uniquely named variables in loop to a certain location

Question

Roel 2018-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/396794-save-uniquely-named-variables-in-loop-to-a-certain-location

评论： KSSV 2018-4-23

Hello everyone,

I am running a loop where a variable U is calculated and saved in a .mat file under a unique name every iteration. To name the .mat file I use sprintf:

 for j:length(d)
    % Long calculation of U left out
    save(sprintf('U%02d',j+1), 'U',  '-v7.3');
  end

Each U is now saved in a .mat file named with the iteriation number with two digits after 'U' and in mat version 7.3. This works great.

However, I would also like define the folder location where the .mat file is saved. I know how to do this using the save command without sprintf but I can't seem to get this to work in combination with sprintf.

Any help is greatly appreciated,

Thank you, Roel

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Answer 1

Stephen23 2018-4-23

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https://ww2.mathworks.cn/matlabcentral/answers/396794-save-uniquely-named-variables-in-loop-to-a-certain-location#answer_316700

编辑：Stephen23 2018-4-23

在 MATLAB Online 中打开

Do NOT concatenate paths/directories. The recommended method is to use fullfile:

fullname = fullfile(dir1path,dir2path,...,filename)

This will automatically take into account the required file separators. For your case, something like this:

sdp = some directory path
for k = 1:numel(d)
    % Long calculation of U left out
    fnm = sprintf('U%02d.mat',k+1); 
    save(fullfile(sdp,fnm), 'U', '-v7.3')
end

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Roel 2018-4-23

Thank you,

I had never heard of fullfile, great!

Stephen23 2018-4-23

编辑：Stephen23 2018-4-23

@Roel: you should use fullfile, as it handles the file separator quite nicely.

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Answer 2

KSSV 2018-4-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396794-save-uniquely-named-variables-in-loop-to-a-certain-location#answer_316695

在 MATLAB Online 中打开

path = pwd ;     % Give your path here 
filename = [pwd,filesep,sprintf('U%02d',j+1)]

By the way, you need not save data of iteration into different .mat files. You can save them into a 3D matrix or cell and save it into a singl mat file.