How can I read multiple mat files and perform ttest2 function?

Question

emmanouil alexakis 2020-11-24

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回答： Mathieu NOE 2020-11-24

hi!

I have 108 mat files and I must go through them and test them by 2. The thing is, I haven't find a way to include all of them, without having to call them seperetaly,and at the same time storing the results for each comparison.( i am doing a ttest for each pair of files). Obvious a loop will be the answer but haven't any idea how to put the files in the loop.

Thank you!

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Answer 1

dpb 2020-11-24

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编辑：dpb 2020-11-24

Arrange the name convention so they will sort in the desired sequence and can process by twos -- then

d=dir(fullfile('directory','appropriatename*.mat'));  % return the list of files
for i=1:2:numel(d)
  data1=importdata(fullfile(d(i).folder,d(i).name));
  data2=importdata(fullfile(d(i+1).folder,d(i+1).name));
  % do whatever with the two files here before going on...save the results wanted
end

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Answer 2

KSSV 2020-11-24

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This question has been discussed to death. A simple search will give you lot of links.

matFiles = dir('*.mat') ; 
N = length(matFiles) ;
for i = 1:N
    thisFile = matFiles(i).name ; 
    load(thisFile) ; 
    % Do what you want 
end

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Answer 3

Mathieu NOE 2020-11-24

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makecomb.m

hello

my single for loop code example

enjoy

n = 108;; % number of files
s = 2; % create combination of 2 elements
[comb,nComb]=makecomb(n,s) % combinations
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%  This functions evaluates all possible combinations of N elements
%    taken by sets of S elements.
%  Usage: [comb,nComb]=makecomb(number_of_elements,size_of_each_combination);
%  Return values:
%    comb: a S x nComb matrix where each column of S rows contains a possible
%          combination of N elements;
%    nComb: number of evaluated combinations (and number of columns of comb);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for ci = 1:nComb
    file1 = ['file' num2str(comb(1,ci))];
    file2 = ['file' num2str(comb(2,ci))];
    
    % your code here
end
        