How to process multiple .csv files?

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)

Answer 1

[Stephen23]

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

Answer 2

[madhan ravi]

See Processing sequence of files

Answer 3

[flemingtb]

Wow that worked. Basically it's opening each file and doing the analysis that i normally was doing one at a time. The data is a matrix of (Z) height data, where all i am doing is calculating the range and creating a contour plot for each.

The batch file code is creating the contour plots but the only range i'm getting is the range of the last file. How can i get a range value for each file?

[Stephen23]

@flemingtb: see the link that madhan ravi gave: this shows how to store imported file data in a cell array. Then you can access all of that imported data using cell indexing or a comma-separated list, e.g.:

C = cell(...);
for k = ...
    C{k} = ...
end
M = horzcat(C{:})

Answer 4

[flemingtb]

Got it, thanks.