How to merge the three mat files?

I have three mat files. I wan a new mat file to which I want to copy the data of all these 3 mat files except the variables for which first I want to merge their data and then store that merged data in that new mat file. The variables for which I want merging their data are:

1- All "one1" variables in a single variable

2- All "two" variables in a single variable

3- All "time" variable in a single variable

[Stephen23]

What exactly does "merge" mean to you? Concatenation or interpolation or subsampling or getting the max/min values or zip alternating values together or something else? If you do not define "merge" then we have to guess what you want.

[Walter Roberson]

How do you want to handle (for example) Noise ? You want to copy the data of the three mat files, so you want to copy Noise. Should we assume that all the values are the same between the mat files except for one1 two and time ? Should we produce (for example) Noise1 Noise2 Nois3 ?

whos -file a1

  Name                   Size            Bytes  Class     Attributes

  Noise                  1x1                 8  double              
  NoiseRange             1x31              248  double              
  Runs                   1x1                 8  double              
  bestFitness            1x1                 8  double              
  bestFitness_temp       1x1                 8  double              
  bestVector             1x3                24  double              
  bestVector_temp        1x3                24  double              
  dim                    1x1                 8  double              
  i                      1x1                 8  double              
  ix                     1x3                24  double              
  ix1                    1x3                24  double              
  j                      1x1                 8  double              
  lb                     1x3                24  double              
  one                   31x1               248  double              
  one1                  31x1               248  double              
  time                   1x1                 8  double              
  two                   31x1              3968  cell                
  u                      1x3                24  double              
  ub                     1x3                24  double              

whos -file a2

  Name                   Size            Bytes  Class     Attributes

  Noise                  1x1                 8  double              
  NoiseRange             1x31              248  double              
  Runs                   1x1                 8  double              
  bestFitness            1x1                 8  double              
  bestFitness_temp       1x1                 8  double              
  bestVector             1x3                24  double              
  bestVector_temp        1x3                24  double              
  dim                    1x1                 8  double              
  i                      1x1                 8  double              
  ix                     1x3                24  double              
  ix1                    1x3                24  double              
  j                      1x1                 8  double              
  lb                     1x3                24  double              
  one                   31x1               248  double              
  one1                  31x1               248  double              
  time                   1x1                 8  double              
  two                   31x1              3968  cell                
  u                      1x3                24  double              
  ub                     1x3                24  double              

whos -file a3

  Name                   Size            Bytes  Class     Attributes

  Noise                  1x1                 8  double              
  NoiseRange             1x31              248  double              
  Runs                   1x1                 8  double              
  bestFitness            1x1                 8  double              
  bestFitness_temp       1x1                 8  double              
  bestVector             1x3                24  double              
  bestVector_temp        1x3                24  double              
  dim                    1x1                 8  double              
  i                      1x1                 8  double              
  ix                     1x3                24  double              
  ix1                    1x3                24  double              
  j                      1x1                 8  double              
  lb                     1x3                24  double              
  one                   31x1               248  double              
  one1                  31x1               248  double              
  time                   1x1                 8  double              
  two                   31x1              3968  cell                
  u                      1x3                24  double              
  ub                     1x3                24  double              

[Sadiq Akbar]

@Stephen23

@Walter Roberson

Thanks a lot for your kind responses. Yes, I want to copy the data of all the variables as it is but I want to concatenate the data of the mentioned variables using the same variables names. However, in addition to that if you can do interpolation or subsampling of the mentioned variables and by storing the interploated or subsampled data in new variables, it will be much better.

Answer 1

[Mathieu NOE]

hello

a quick and dirty solution, you may have to find a way to generalize to more variables in that may be the case in the future

fileDir = pwd; % current directory (or specify which one is the working directory)

S = dir(fullfile(fileDir,'a*.mat')); % get list of data files in directory

%% recommended  
% S = natsortfiles(S); % sort file names into natural order , see : 
%            %(https://fr.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort)

out_one = []; % one 
out_two = []; % two 
out_time = []; % time 

for k = 1:length(S)
    filename = S(k).name % shows filenames are correctly sorted (see command window)
    load( fullfile(fileDir, filename)); % 
    out_one = [out_one; one]; % vertical concatenation
    out_two = [out_two; cell2mat(two)]; % vertical concatenation
    out_time = [out_time; time(:)]; % vertical concatenation
end

[Sadiq Akbar]

@Mathieu NOE

Thanks a lot for your guiadance.

[Mathieu NOE]

my pleasure !!