How to load txt files from subfolders
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
There is error as i am trying to load .txt files from subfolders. How can i load all *.txt files using generated function (imptxt(FileName,startRow,endRow))
if true
Files=dir('**/*AVE*.txt'); % looking for txt files with 'AVE' at the beginning
for k=1:length(Files) % k=46
FileNames=Files(k).name
end
ImpFiles=zeros(k,100000);
for i=1:k
ImpFiles(i,:)=imptxt(Files(i).name,1,1); % loading all files in one array using generated function for import
end
and i have such error:
if true
Error using textscan
Invalid file identifier. Use fopen to generate a valid file identifier.
if true
Error in imptxt (line 100034)
dataArray = textscan(fileID, formatSpec, endRow(1)-startRow(1)+1, 'Delimiter', delimiter, 'TextType', 'string', 'EmptyValue', NaN,
'HeaderLines', startRow(1)-1, 'ReturnOnError', false, 'EndOfLine', '\r\n');
Error in BN (line 17)
ImpFiles(k,:)=imptxt(Files(k).name,1,1);
% code
end
UPD. I checked and it working but only if i start it inside one of subfolders. Otherwise it shows same error as above
8 commentaires
Jan
le 12 Juil 2018
Modifié(e) : Jan
le 12 Juil 2018
This loop is useless:
for k=1:length(Files)
FileNames=Files(k).name
end
It overwrites FileNames repeatedly.
I'm convinced that the M-file imptxt with more than 100'000 lines of code is rubbish. Which tool did create this function? In any case, something went wrong. I recommend to start from scratch again and create a better tool for importing.
Réponse acceptée
Jan
le 12 Juil 2018
Modifié(e) : Jan
le 12 Juil 2018
Files = dir('**/AVE*.txt');
for k = 1:length(Files)
FileName = fullfile(Files(k).folder, Files(k).name);
ImpFiles(k,:) = dlmread(FileName);
end
It is smarter to run the code in backward direction:
for k = length(Files):-1:1
Then ImpFiles has the correct size in the first iteration and Matlab does not waste time with the iterative growing of the array.
Plus de réponses (1)
Alexandr Lozak
le 12 Juil 2018
Modifié(e) : Alexandr Lozak
le 12 Juil 2018
3 commentaires
Jan
le 12 Juil 2018
It is not safe to change the current folder by cd. Note that any callback of GUIs or timers can change the current folder unexpectedly also. So better use the absolute path. See my answer.
The two loops are not useful. You create the variable "FileNames", but do not use it. So the loop over k is meaningless.
By the way: does this answer solve your problem? If not, accepting it is not useful, because the readers in the forum think, that your question is solved already.
Voir également
Catégories
En savoir plus sur Text Files dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!