Reading specific lines from text file

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as hz
as hz 2012-9-25
Hi,
I have a text file (PCdata.txt) which I wish to read lines Xa, Xb and than lines Xa+14, Xb+14, Xa+14*2, Xb+14*2 … Xa+14*n, Xb+14*n until the end of the file.
Can some please explain me how to do it.
Cheers.

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回答（1 个）

Image Analyst
Image Analyst 2012-9-25
Look up the help for fread(), fgets() or fgetl(), and fclose(). Basically, open the file, with fgets() read Xa-1 lines and ignore them, then read the Xa'th line, throw away some more lines until you get to the Xb'th line and then read that, etc.
  1 个评论
as hz
as hz 2012-9-25
Hi,
Thanks for the help.
The solution is below if someone will need it:
fid = fopen('filename','rt');
nlines = 0;
while (fgets(fid) ~= -1),
nlines = nlines+1;
end
fclose(fid);
C = textread('filename', '%s','delimiter', '\n');
lm1=3;
lm2=5;
rowindx = 1;
while rowindx < nlines
point1=C{lm1};
point2=C{lm2};
lm1=lm1+14;
lm2=lm2+14;
rowindx = rowindx+14;
end

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