Can Matlab read the most recent made file in the default folder?

Question

C Zeng 2015-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/203432-can-matlab-read-the-most-recent-made-file-in-the-default-folder

编辑： Jan 2022-11-8

采纳的回答： Jan

Hello, just want to know if Matlab can import the file that is most recent made based on their modified date and time?

I have several Excel files and want it read and do analysis?

Thanks.

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Answer 1

Jan 2022-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/203432-can-matlab-read-the-most-recent-made-file-in-the-default-folder#answer_904985

编辑：Jan 2022-11-8

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A summary of the comments:

d            = dir('somefolder/*txt');
[~, index]   = max([d.datenum]);
youngestFile = fullfile(d(index).folder, d(index).name);  % [EDITED], typo fixed
                                                          % Thanks, Andres Morales

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Andres Morales 2022-11-8

Seems like you have an extra ")" on the 3rd line.

Jan 2022-11-8

@Andres Morales: Thanks. I've fixed it.

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Answer 2

pfb 2015-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/203432-can-matlab-read-the-most-recent-made-file-in-the-default-folder#answer_175203

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Hi,

you could get the excel files with

d= dir('*xls');

and then compare the dates. These are in

d(j).date

You probably better convert them to numbers to compare them

 dd = zeros(length(d));
 for j = 1:length(d)
  dd(j) =datenum(d(j).date);
 end
 [tmp i]=max(dd);
 load(dd(i).name)

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Yan Kai Lai 2022-2-26

编辑：Yan Kai Lai 2022-2-26

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I used the answer by pfb to read the most recent txt file. To make the answer more complete:

d = dir('somefolder/*txt');
dd = zeros(length(d), 1); % to init as vector instead of square matrix
for j = 1:length(d)
    dd(j) = datenum(d(j).date);
end
[~, i] = max(dd); % tmp is the datenum, which is not necessary
lines = readlines(fullfile(d(i).folder, d(i).name)) % should be d instead of dd.

Stephen23 2022-2-26

编辑：Stephen23 2022-2-26

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Converting to DATENUM is not required because the DIR output structure already contains serial date numbers, so that superfluous loop can be simply replaced by this:

dd = [d.datenum];

See: https://www.mathworks.com/help/matlab/ref/dir.html#bsnswnx-1-listing

https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

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