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How to read data from text file upto some point defined by "1"?

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Rinu
Rinu 2014-11-30
评论： Rinu 2014-12-1
I'm trying to read data from a number of text files (using a loop) using fscanf upto some point in the file where "1" occurs. I cannot set the "size" in fscanf(fid,'%f',size) because the "1" doesn't occur at the same place in each file. Is there a way to tell Matlab to scan only upto the "1" by something like this (it helps because no data point is equal to "1"):
while fscanf(fid,'%f',1)~=1
scan=fscanf(fid,'%f')
end
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dpb
dpb 2014-11-30
What's the form of the text? Is the objective the first character '1' and is it important to be that precise character or the line containing the character or what? What's the desired result?
So many questions, so few answers/details... :)

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Guillaume
Guillaume 2014-11-30
Assuming your file is just numbers and spaces, and that you want to stop at the first whole number equal to one (and not the 1 in 30.102 for example), no, there isn't a simpler way than using fscanf as in your example. Your while is a bit wonky though:
n = fscanf(fid, '%f', 1);
while ~isempty(n) && n~=1
scan = [scan n];
n = fscanf(fid, '%f', 1);
end
However, it may be more efficient / faster to just read the whole file and truncate the returned array at the first 1:
scan = fscanf(fid, '%f')
pos = find(scan == 1, 1);
scan(pos:end) = [];

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