TEXTREAD File not found error

2018 3 11
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回答已采纳
更新时间：2018 3 13
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Hi,
I've been trying to create a loop that will read an arbitrary text file under certain circumstances, but send an error for further prompt if it is not the correct file name (and/or extension).
However, I have the loop running perfectly if the file is there and correctly inputted by the user, if not then it still runs the next bit of the loop (the thank you message) and I get this error:
Error using textread (line 165)
File not found.
Error in Assignment (line 13)
EEGData = textread(Datafile);
My script is:
Datafile=input('Please enter filename with extension: ','s');
if exist ('eegdata.txt', 'file');
disp(sprintf('Thank you, please wait a moment'));
EEGData = textread(Datafile);
else
disp(sprintf('I''m sorry, this file does not exist, try again'))
end
Thanks!

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 采纳的回答

Stephen23
Stephen23 2018-3-11

0 个投票

if 2==exist(Datafile, 'file')

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Zara Roddis
Zara Roddis 2018-3-11
If I run this
Datafile=input('Please enter filename with extension: ','s');
if 2==exist(Datafile, 'file')
disp(sprintf('Thank you, please wait a moment'));
EEGData = textread(Datafile);
else
disp(sprintf('I''m sorry, this file does not exist, try again'));
end
then it sends the displayed error message and runs the rest of the script even if the file isn't correctly identified.
Jan
Jan 2018-3-11
There is no need for an sprintf() here. But disp() is not useful also. Call error() instead.
Stephen23
Stephen23 2018-3-11
编辑：Stephen23 2018-3-11
As Jan Simon wrote, you will probably find error more useful:
if 2 == exist(Datafile, 'file')
disp('Thank you, please wait a moment');
EEGData = textread(Datafile);
else
error('I''m sorry, this file does not exist, try again')
end
Or simplify the whole thing by removing the if entirely and calling assert:
assert(2==exist(Datafile,'file'),'This file does not exist, try again')
disp('Thank you, please wait a moment');
EEGData = textread(Datafile);
Zara Roddis
Zara Roddis 2018-3-12
Ah that works brilliantly, thank you both
Zara Roddis
Zara Roddis 2018-3-13
Is there a way of incorporating this into a loop so the script doesn't have to be reloaded each time the user inputs the wrong file?
Stephen23
Stephen23 2018-3-13
编辑：Stephen23 2018-3-13
Try something like this:
isf = false;
msg = 'enter filename with extension: ';
while ~isf
fnm = input(msg,'s');
isf = 2==exist(fnm,'file');
msg = 'try another filename: ';
end
disp('Thank you, please wait a moment');
EEGData = textread(fnm);
Personally I find throwing an error a better choice.

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