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Looping through folders and perform script

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PAK on 30 Aug 2018
Commented: PAK on 17 Oct 2018
Hi All,
I have data that is in 3 subdirectories "LFP", "Pos", and "Neg". Each folder has the same number of .mat files in it, say 8 for this example. I have an analysis script that I have written that works. Now I would like to loop through all the files in each of the folders and run the analysis and save the output.
It would look something like:
load Pos/times_NS6_001.mat
load LFP/NS3.001.mat
% perform body of script %
% then save output %
savename = fullfile(char(strcat('Phase_Locking_','NS6_001','NS3_001')));
save(savename,'polarhistograms', 'pval', 'z');
Then I would loop through and do the same for Pos/times_NS6_00(2-8) and LFP/NS3.00(2-8). After this it would be the same for Neg/times_NS6_00(1-8) and LFP/NS3.00(1-8).
I need to basically test every file in the LFP folder with every file in both the "Pos" and "Neg" folders (all combinations).
Any help on what to add to my code to get this done in an efficient way would be much appreciated!


Rik on 6 Sep 2018
Did my suggestion solve your problem? If so, please consider marking it as accepted answer. It will make it easier for other people with the same question to find an answer. If it didn't solve your question, please comment with what problems you are still having.
PAK on 12 Sep 2018
Hi Rik,
I'm still working through this code, got a little bit busy with another project. I will reply once I figure it out.
Thanks for your comment and followup!
PAK on 17 Oct 2018
This worked perfectly! Thank you so much!

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Accepted Answer

Rik on 30 Aug 2018
Edited: Rik on 31 Aug 2018
  1. Use a dir call to figure out the number of suffixes (or suffices?)
  2. Use two nested loops to determine the selection of your .mat files. You could even use the output by dir directly as you for loop array (just transpose the struct).
for pos_or_neg=[pos_files;neg_files]'
load([pos_or_neg.folder filesep])
for current_lfp=lfp_files'
load([current_lfp.folder filesep])
% perform body of script %
% then save output %
savename = %you can use the name fields for naming%
save(savename,'polarhistograms', 'pval', 'z');


Stephen Cobeldick
Stephen Cobeldick on 31 Aug 2018
@Rik Wisselink: you missed some relevant parts of the question: "Each folder has the same number of .mat files in it, say 8 for this example" and "Then I would loop through and do the same for Pos/times_NS6_00(2-8) and LFP/NS3.00(2-8)": so the number of files can vary, and thus hard-coding NS6_001 and NS3_001 is not going to help.
Rik on 31 Aug 2018
@Stephen As it wasn't clear to me what the naming scheme should be (as it would overlap between pos and neg), I left that line as it was. I now removed that to avoid confusion.

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