How to load txt files from subfolders
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Alexandr Lozak
am 9 Jul. 2018
Kommentiert: Alexandr Lozak
am 12 Jul. 2018
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 Kommentare
Jan
am 12 Jul. 2018
Bearbeitet: Jan
am 12 Jul. 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.
Akzeptierte Antwort
Jan
am 12 Jul. 2018
Bearbeitet: Jan
am 12 Jul. 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.
Weitere Antworten (1)
Alexandr Lozak
am 12 Jul. 2018
Bearbeitet: Alexandr Lozak
am 12 Jul. 2018
3 Kommentare
Jan
am 12 Jul. 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.
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