Bench Fid
November 22nd, 2010
Bench Fid
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MATLAB, what does feof do?
I don't understand foeof, and why ~feof is used?
fid = fopen('bench.dat');
k = 0;
while ~feof(fid)
curr = fscanf(fid,'%c',1);
if ~isempty(curr)
k = k+1;
benchstr(k) = curr;
end
end
fclose(fid);
Ok, so you have a file identified by the file id fid. When Matlab opens the file, it uses a "read marker" to keep track of its current position in the file. Basically, feof(fid) tests whether the current position is at the end of the file. If it is, feof returns true; if not, feof returns false.
The ~ character means "not". Kind of like the logical version of multiplying by -1. It changes a true value to false, and a false value to true. So ~feof(fid) returns a false if you're at the end of the file, and a true otherwise.
Within the while statement, that means, reenter the loop if you're not yet at the end of the file, and stop looping if you are at the end of the file.
I hope that helps!