finding same pattern files from two different folders and copying to other folders

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wave_buoys 2020-5-21

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评论： wave_buoys 2020-5-21

Hi everyone,

I have two different folders (Folder 1 and Folder 2) that contain netcdf files from two different fields (UV, and ST) with 3hour-internal outputs. Those files are named as yyyyMMddHH patterns. At some steps, some files are missing. Therefore, I need to find files having the same time steps (same yyyyMMddHH) from each folder and copying into other folders (Folder 3 and Folder 4) respectively. An illustration is attached.

Could you please help?

Thanks

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wave_buoys 2020-5-21

Hi per,

Missing files cannot be determined in Folder 1 and Folder 2 as in each of these folders I have several thousand files. These missing files were due to downloading issues. As you can see files would follow a 3 hour-time interval if the downloading process was ok.

per isakson 2020-5-21

编辑：per isakson 2020-5-21

Problem is, I fail to deduce the rule that determines which files to copy; the highlighted files. Why should *_2001010100 be copied?

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Answer 1

Stephen23 2020-5-21

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编辑：Stephen23 2020-5-21

在 MATLAB Online 中打开

Read the folder contents using dir.

Extract the timestamps (e.g. regexp or indexing)

Call intersect on the timestamps, returninng both indices.

Use the indices to copy the files using copyfile in a loop.

Something like this (untested, but should get you started):

D1 = 'absolute/relative path to the 1st folder';
D2 = 'absolute/relative path to the 2nd folder';
S1 = dir(fullfile(D1,'*_*.nc'));
S2 = dir(fullfile(D2,'*_*.nc'));
C1 = {S1.name};
C2 = {S2.name};
T1 = regexp(C1,'\d+','match','once'); % extract timestamps
T2 = regexp(C2,'\d+','match','once'); % extract timestamps
[~,X1,X2] = intersect(T1,T2); % identify common timestamps
D3 = 'absolute/relative path to the 3rd folder';
D4 = 'absolute/relative path to the 4th folder';
for k = 1:numel(X1)
    F1 = C1{X1(k)};
    F2 = C2{X2(k)};
    copyfile(fullfile(D1,F1),D3)
    copyfile(fullfile(D2,F2),D4)
end