loading multiple mat files from a directory one by one, and running a script for them

Question

Native 2019-5-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464729-loading-multiple-mat-files-from-a-directory-one-by-one-and-running-a-script-for-them

编辑： Image Analyst 2022-4-10

Hi,

I need to execute the following steps in matlab:

Load a file (from a directory containing multiple files of interest). The order wouldn't matter. I just need to do it for all files, but one by one.
Run a predefined script on that mat file.
Save a variable
Delete all variables and load the next mat file with its new variables
Run the same process for the next mat file in the directory

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Answer 1

KSSV 2019-5-30

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464729-loading-multiple-mat-files-from-a-directory-one-by-one-and-running-a-script-for-them#answer_377167

在 MATLAB Online 中打开

matfiles = dir('*.mat') ; 
N = length(matfiles) ; 
iwant = cell(N,1) ;  % to save output 
for i = 1:N
    load(matfiles(i).name)
    % do what you want, let out put be out
    iwant{i} = out
end

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Walid 2022-4-10

work fine, thanks !

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Answer 2

Image Analyst 2022-4-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/464729-loading-multiple-mat-files-from-a-directory-one-by-one-and-running-a-script-for-them#answer_939405

编辑：Image Analyst 2022-4-10

在 MATLAB Online 中打开

See the FAQ:

https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

There are code samples in the FAQ to do it two different ways. In short,

matFiles = dir('*.mat') ; 
numFiles = length(matFiles) ; 
for k = 1 : numFiles
    % Get file name of one mat file.
    thisFileName = fullfile(pwd, matFiles(k).name);
    fprintf('Processing "%s".\n', thisFileName);
    % Load mat file variables.  Any prior ones will be overwritten.
    s = load(thisFileName) % This is a structure with all the variables on it as fields.
    % Now "Run a predefined script on that mat file."
    output(k) = PredefinedFunction(s);
end