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

[Star Strider]

I don’t have any recent experience with fgetl but it might be what you want. Otherwise, you may have to read in the entire file and then test it.

[Rinu]

Thanks, I'll try that.

[dpb]

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... :)

Answer 1

[Guillaume]

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) = [];

[Rinu]

Thanks a lot!!