how to scan text

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Kobi
Kobi 2014-12-2
评论： Star Strider 2014-12-2
on those files:
http://iopscience.iop.org/0266-5611/17/6/301/media/rectTE_8f.exp
http://iopscience.iop.org/0266-5611/17/6/301/media/dielTM_dec4f.exp
on the 5th line there [are these] data:
# Number of frequencies : 8 (2, 4, 6, 8, 10, 12, 14, 16 GHz)
# Number of frequencies : 4 (4, 8, 12, 16 GHz)
i need to create a vector with those values i tried to locate the number 8 or 4 using textscan and to make a for loop n times to get those integers, but it didn't work, maybe there is something with the (,)
any suggestions?

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采纳的回答

Star Strider
Star Strider 2014-12-2
The frequencies are integers in the third column. This code works for the first file and should work for both:
fidi = fopen('rectTE_8f.exp');
d = textscan(fidi, '%d%d%d%f%f%f%f', 'Headerlines',10, 'Delimiter','\n','CollectOutput',1);
frqs = d{1}(:,3);
The ‘frqs’ variable is your vector of frequencies.
If you want a vector of only the frequencies on the 5th line, you can get them easily enough with:
ufrqs = unique(frqs);
It will give you a vector of the unique frequencies in the vector.
  2 个评论
Kobi
Kobi 2014-12-2
thank you Star Strider, that was very helpful.
Star Strider
Star Strider 2014-12-2
My pleasure!

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更多回答（2 个）

Guillaume
Guillaume 2014-12-2
You have to use low level io functions if you want to parse the header:
fid = fopen('rectTE_8f.exp', 'rt');
for l = 1:4
fgetl(fid); %skip first four lines
end
numfreq = fscanf(fid, '# Number of frequencies : %d (');
frequencies = fscanf(fid, '%d, ', [1 numfreq]);
fgetl(fid); %get rest of line
for l = 6:10
fgetl(fid); %skip rest of header
end
arr = textscan(fid, ...); %get rest of file with textscan
fclose(fid);
dpb
dpb 2014-12-2
When you get to that line, either by headerlines or previously parsing if you need some of those data, then
n=cell2mat(textscan(fid,'# Number of frequencies : %d (')); % read the number of freq's
Now you can build a format string using that value as--
fmt=['(' repmat('%d,',1,n-1) '%d GHz)'];
f=cell2mat(textscan(fid,fmt));

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