Reading specific lines from text file

Question

as hz 2012-9-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/49028-reading-specific-lines-from-text-file

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.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2012-9-25

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/49028-reading-specific-lines-from-text-file#answer_59900

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
显示 -1更早的评论隐藏 -1更早的评论

as hz 2012-9-25

在 MATLAB Online 中打开

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