How do you populate a struct with multiple loaded .mat files?

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David Mabwa
David Mabwa 2020 年 9 月 29 日
編集済み: David Mabwa 2020 年 10 月 14 日
So I have this code below that loads my data. It works fine when not wrapped in a function, however when I wrap it in a function it doesn't work. While debugging, I can see it loading my files, however, when I get to the end of the function, they don't load onto the current workspace.
Secondly, when I assign a variable for the data files to load into, they load fine when I am only dealing with one file. When I try to load multiple files however, it doesn't run as expected. It keeps overwriting each loaded array in the struct.
I'm not at all sure what i'm doing wrong
Any help is appreciated.
Thank you!
function S=LoadData % When not wrapped in function, doesn't output S
'MATLAB Files (*.m,*.mlx,*.fig,*.mat,*.slx,*.mdl)';
'Images (*.jpg,*.jpeg,*.png,*.tif,*.tiff)'},...
'Select a File','MultiSelect','on');
if isequal(file,0)
clear file
clear path
if iscell(file)
for k=1:size(file,2)
S=load(fullfile(path,file{k})); % Keeps overwriting S rather than appending
clear file
clear path


Xingwang Yong
Xingwang Yong 2020 年 9 月 30 日
There is a contradiction between your statement and your comment in code. I assume you are asking about " however when I wrap it in a function it doesn't work".
In your case, the scope of variable 'S' is limited within the function LoadData(). You can use nested function to change this behaviour.
function yourMainScript
S = [];
S = LoadData(); % now S will be in the workspace of the main script
function S=LoadData
% ...
As for overwriting, you can avoid it like this
if isempty(S)
S = load(fullfile(path,file{k}));
tmp = load(fullfile(path,file{k}));
for fn = fieldnames(tmp)'
S.(fn{1}) = tmp.(fn{1}); % this will overwrtie if have same fieldnames
Loop over fields of a struct can be found here:
  1 件のコメント
David Mabwa
David Mabwa 2020 年 10 月 14 日
編集済み: David Mabwa 2020 年 10 月 14 日
Thank you, that worked like a charm. My main issue was with the overwriting.


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