Re: Error while opening a .txt file

[N]

> Am 07. Juni 2020 um 14:13 Uhr schrieb "N":
> > Would suggest the following so that file is closed before exit in case of 
> > an error, as I remember there might be problems otherwise.
> >
> >
> > [fid msg] = fopen('data.txt', 'r');                % Open file
> > if(fid == -1)                                      % Error occured?
> >   error(msg)                                         % Throw error and show 
> > error messsage what went wrong
> > end
> >
> > try                                                % Start try block so 
> > that error could be catched and file closed
> >   data = textscan (fid, '% f', 'HeaderLines', 5);
> >   period_arr = data {1};
> > catch err                                          % Catch error in case it 
> > happen, rows below are not run then everything is OK
> >   fclose(fid);                                       % This is needed 
> > otherwise file is not closed then you make error in code and it is a problem
> >   rethrow(err)                                       % Rethrow the same 
> > error but here file have been closed before error
> > end
> >
> >
> > Nicklas SB Karlsson
> >
> 
> Consider using "unwind_protect" instead of "try", or the fid will only be 
> closed if an error occurs.
> Or remember to fclose(fid) after the catch-block.
> 
> Markus

Removed fclose(fid) at end by misstake and did not know about the 
unwind_protect block, never seen it before.