MATLAB: How to process multiple .csv files

batch process csv

I have a folder of .csv files i'd like to process as a batch, meaning perform analysis on each file individually. Here is the code to open the files, that i found. I'm getting an error i don't understand.
myFolder = 'B:\Projects\Concert\OfflineWarpGauge\FF_Data\Day1';
% 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, '*.csv'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for k = 1 : length(theFiles)
  baseFileName = theFiles(k).name;
  fullFileName = fullfile(myFolder, baseFileName);
  fprintf(1, 'Now reading %s\n', fullFileName);
end
Error Message:
Function 'subsindex' is not defined for values of class 'struct'.
Error in BatchProcessFiles (line 13)
for k = 1 : length(theFiles)

Best Answer

You have a variable named length. This means when you write this:
for k = 1 : length(theFiles)
you are telling MATLAB that you want to indexing into the variable length using theFiles (which is a structure). Structures are not able to be used as indices, so this throws an error.
Solution: rename that variable, and call this:
clear length
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