Error using exist "The optional second input to exist must be 'var', 'builtin','class', 'dir' or 'file' "
7 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Angelo Figueiredo
am 19 Feb. 2019
Bearbeitet: Adam Danz
am 19 Feb. 2019
I don't understand why the following code doesn't work
for k = 1:4
% Create a text file name, and read the file.
textFileName = ['A' num2str(k) '.txt'];
if exist(textFileName, 'A')
fid = fopen(textFileName, 'rt');
mydata = fread(fid);
fclose(fid);
else
fprintf('File %s does not exist.\n', textFileName);
end
end
1 Kommentar
Steven Lord
am 19 Feb. 2019
What do you think this does or want it to do?
if exist(textFileName, 'A')
You expect this if condition to be satisfied if ... ?
Once we know that we may be able to help you write the correct command.
Akzeptierte Antwort
Adam Danz
am 19 Feb. 2019
Bearbeitet: Adam Danz
am 19 Feb. 2019
It looks like you're checking the existance of a certain file named something like "A1.txt" on the matlab path prior to reading that file. The exist() function has 1 mandatory input and 1 optional input. The optional input allows you to specify the type of result to search for. If you're searching for a file, one of those option for the 2nd input is 'file'.
The correct way to search for the existance of that file on the matlab path is:
if exist(textFileName, 'file')
0 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu File Operations finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!