Cycling through file names in a struct

I have an nx1 struct which contains the names of all the files in the directory Im using. For context, here's an example 6x1 struct:

'677_FM02_HF_6-16-2020.ep'	'C:\Users\Desktop\F-DAS Matlab\ProcessFiles'	'04-Jan-2021 13:49:41'	10644	false	738160.576168982
'685_FM01_HF_7-21-2020.ep'	'C:\Users\Desktop\F-DAS Matlab\ProcessFiles'	'04-Jan-2021 13:49:41'	10619	false	738160.576168982
'689_FM03_HF_6-16-2020.ep'	'C:\Users\Desktop\F-DAS Matlab\ProcessFiles'	'04-Jan-2021 13:49:41'	10644	false	738160.576168982
'699_FM04_HF_.6-16-2020.ep'	'C:\Users\Desktop\F-DAS Matlab\ProcessFiles'	'04-Jan-2021 13:49:41'	10642	false	738160.576168982
'766_FM06_HF_6-15-2020.ep'	'C:\Users\Desktop\F-DAS Matlab\ProcessFiles'	'04-Jan-2021 13:49:41'	10625	false	738160.576168982
'786_FM05_HF_6-15-2020.ep'	'C:\Users\Desktop\F-DAS Matlab\ProcessFiles'	'04-Jan-2021 13:49:41'	10919	false	738160.576168982

I want to cycle through the first column (the name column) in a for loop where each loop saves the file name as a variable.

So far the code I have is

FMdir = dir('*FM*.ep'); %Get a list of all of the final measurement files in the directory
FMn = numel(FMdir);

for n= 1:FMn %cycle through 
   if( isnumeric(FMdir.(fn{n})))
   end 

But it's throwing an error saying

   Error using isnumeric
Too many input arguments.

Error in ProcessFilesTry (line 19)
   if( isnumeric(FMdir.(fn{n})))
   end
   

Anyone know how I can fix this?

Answer 1

[Walter Roberson]

FMdir is a struct array with fields such as name and folder . You would not want to dynamically construct references to the fields of that struct.

FMdir = dir('*FM*.ep'); %Get a list of all of the final measurement files in the directory
FMn = numel(FMdir);
for n = 1 : FMn
    thisname = FMdir(n).name;
    [~, basename, ext] = fileparts(thisname);
    as_num = str2double(basename);
    if ~isnan(as_num)
        %filename was purely numeric
    end
end

However... not even one of the filenames you post is purely numeric. Did you want to extract up to the first underscore and test that to see if it is numeric?

  nameparts = regexp(basename, '_', 'split');
  as_num = str2double(nameparts{1});