Borrar filtros
Borrar filtros

textscan error only in loop: "Invalid file identifier. Use fopen to generate a valid file identifier"

1 visualización (últimos 30 días)
Hi,
I am receiving textscan error when I create a loop to process and write my files. If I run each file individually without a loop, it works without any problem. If anyone knows what will be the reason of it?
"Error using textscan.Invalid file identifier. Use fopen to generate a valid file identifier."
[fname,pname] = uigetfile("MultiSelect","on",'*.dat')
fname=[pname, fname];
if isequal(fname,0)
disp('User selected Cancel');
else
disp(['User selected ', fullfile(pname, fname)]);
end
for k = 1 : length(fname)
fprintf('Now reading file %s\n', fname{k});
fid=fopen(fname{k},'r');
F=textscan(fid,'%f','HeaderLines',17);
Temp=F{1,1}
T_out = timetable(datetime(2018,1,17,0,0,10*(0:size(Temp,1)-1)'),Temp);
time_array=datetime("29-May-2018 00:00:00", "InputFormat","dd-MMM-uuuu HH:mm:ss")
summerstart=find(T_out.Time=="29-May-2018 00:00:00")
Tsummer=T_out([summerstart]:end,:)
[filepath,name,ext] = fileparts(fname)
writetimetable(Tsummer,[name 'r.csv'])
end
Thanks a lot!

Respuesta aceptada

Stephen23
Stephen23 el 21 de Abr. de 2022
Editada: Stephen23 el 21 de Abr. de 2022
This will not work as you require:
fname=[pname, fname];
Instead you should use FULLFILE, to correctly handle the file separator character, for example:
[fnc,fpt] = uigetfile("MultiSelect","on",'*.dat');
if isequal(fnc,0)
return
end
for k = 1:numel(fnc)
fprintf('Now reading file %s\n', fnc{k});
fnm = fullfile(fpt,fnc{k}); % better to use FULLFILE
fid = fopen(fnm,'r');
tmp = textscan(fid,'%f','HeaderLines',17);
fclose(fid); % you need to FCLOSE every file
.. etc
end
  1 comentario
Cakil
Cakil el 21 de Abr. de 2022
Thank you very much, I could not make a connection with fname=[pname, fname] and the textscan error but it works perfectly now :)

Iniciar sesión para comentar.

Más respuestas (1)

Jonas
Jonas el 21 de Abr. de 2022
Editada: Jonas el 21 de Abr. de 2022
use fclose(fid) at the end of the for loop
sometimes, if using a script a file remains open and you may not have the identifier anymore. in this case use fclose('all')

Etiquetas

Productos


Versión

R2021a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by