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changing the name of multiple csv files in a folder

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C.G. on 15 Jan 2021
Commented: Stephen Cobeldick on 15 Jan 2021
I have a folder containing 3000 csv files. All of these are named in the format: cor0.1 sc10 fc0.1_0.csv.
I want to change the name of all of these files to c0_1f0_1_0.csv.
Is there a way i can write a loop to do this for me?


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Accepted Answer

Mathieu NOE
Mathieu NOE on 15 Jan 2021
this is a first attempt
I prefered to create the renamed copies in a separate folder
also my code will probably need some upgrade as I don't know how the numberring inside your filenames can evolve among your 3000 files
d = dir('*.csv')
dir_out = [cd '\out']
for ci = 1:numel(d)
filename = d(ci).name;
ind_und = strfind(filename,'_'); % search underscores
ind_dot = strfind(filename,'.'); % search dots
ind_f = strfind(filename,'f'); % search "f"
new_filename = [filename(1) filename(ind_dot(1)-1) '_' filename(ind_dot(1)+1) filename(ind_f ),...
filename(ind_dot(2)-1) '_' filename(ind_dot(2)+1) '_' filename(end-4:end)];


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Stephen Cobeldick
Stephen Cobeldick on 15 Jan 2021
Rather than fragile indexing, it better to use fileparts to split the filename and file extension:

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More Answers (1)

Matt Gaidica
Matt Gaidica on 15 Jan 2021
Edited: Matt Gaidica on 15 Jan 2021
csvPath = '/path/to/files';
filelist = dir(fullfile(csvPath,'*.csv'));
for iFile = 1:numel(fileList)
thisFile = fullfile(csvPath,fileList(iFile).name);
movefile(thisFile, strrep(thisFile,'old','new'));
This is just psuedocode. I don't quite see how you're mapping the old filename to the new one, so I just placed a string replace function in the loop. If you need help on that piece, please post more details.


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Matt Gaidica
Matt Gaidica on 15 Jan 2021
Mathieu gave a suggestion below. I find strrep to the most readable. Sprintf would also work if you are using the iteration variable.
thisFile = strrep(thisFile,' ',''); % remove single spaces
thisFile = strrep(thisFile,'.',''); % remove period
thisFile = strrep(thisFile,'sc10',''); % remove sc10
If you have multiple spaces, perhaps see here.
Stephen Cobeldick
Stephen Cobeldick on 15 Jan 2021
This SPRINTF call does not use its inputs for anything:
new = sprintf('c0_1f0_1.csv',ii,jj)
C.G. on 15 Jan 2021
I understand sprintf, but i am struggling to write a loop to do this.
I have started using Mathieu's code below, but this reaches 10 iterations and stops even though it identifies 3001 csv's

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