how to read sequence of files that are seemingly random

Question

CLARK KENDRICK GO 2018-7-19

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https://ww2.mathworks.cn/matlabcentral/answers/411243-how-to-read-sequence-of-files-that-are-seemingly-random

编辑： dpb 2018-7-20

I am trying to read 1000+ files with the following filename format: myPos_HH_MM_SS_SSS.mat. There seems to be no pattern for HH_MM_SS_SSS. How do I perform this?

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Answer 1

dpb 2018-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/411243-how-to-read-sequence-of-files-that-are-seemingly-random#answer_329550

编辑：dpb 2018-7-20

在 MATLAB Online 中打开

d=dir(fullfile('YourBaseDirectory','myPos_*.mat');
for i=1:length(d)
  load d((i).name
  ...
  % Do what ever needs done with variables in the .mat file here
  ...
end

will process in alphabetical order. If need in chronological order then

d=dir(fullfile('YourBaseDirectory','myPos_*.mat');
dn=[dn(:).datenum].';          % get the datenums for each file
[~,ix]=sort(dn);               % and sort ascending, save order index
d=d(ix);                       % rearrange the directory struct order

From here on, everything's the same...

for i=1:length(d)
  load d((i).name

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Image Analyst 2018-7-20

cgo, that's what I did. Did you see my answer below? No sorting, just going through your mat files one-by-one just as dir() gives them to you.

dpb 2018-7-20

Which I re-edited to put back what I inadvertently deleted... :)

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Answer 2

Image Analyst 2018-7-20

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在 MATLAB Online 中打开

You did not ask for any sorting (not sure why others are sorting). You simply asked how to read files that have random names, not a sequence in any particular alphanumeric order. So that means you can simply use dir('*.mat') to read the files, as per the FAQ: https://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

% Specify the folder where the files live.
myFolder = pwd; % or wherever;
% Check to make sure that folder actually exists.  Warn user if it doesn't.
if ~isdir(myFolder)
  errorMessage = sprintf('Error: The following folder does not exist:\n%s', myFolder);
  uiwait(warndlg(errorMessage));
  return;
end
% Get a list of all files in the folder with the desired file name pattern.
filePattern = fullfile(myFolder, '*.mat'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
numberOfFiles = length(theFiles);
fprintf('Found %d .mat files in folder: "%s".\n', numberOfFiles, myFolder);
for k = 1 : numberOfFiles
  baseFileName = theFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now loading %s\n', fullFileName);
  % Now "read" (load) the mat file.  Returned value will be a structure.
  s = load(fullFileName)
  % Now do whatever you want with s.
end