dpb
Posts:
6,855
Registered:
6/7/07
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Re: how to remove specific lines from .dat file
Posted:
Dec 6, 2012 2:05 PM
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On 12/6/2012 10:33 AM, ABCD wrote:
> Hi. I have a .dat file which is similar to the following:
> abcdef 123 11aa13
> jwleieo 930 39kw02
> abchyt 153 83je29
>
> and I want to give an instruction in order to remove all the lines
> containing the 'abc' string, which in this particular case, corresponds
> to the first and the third line.
> How can I do this? Thank you for your help
Two basic ways...
a) read the whole file into memory and remove the desired lines then
write the shortened array to a new file, or
fid1=fopen('yourfile','rt');
fid2=fopen('newfile','wt');
while ~feof(fid1)
l=fgetl(fid1);
if strfind(l,'abc'), continue, end
fprintf(fid,'%s\n',l);
end
fid1=fclose(fid1);
fid2=fclose(fid2);
b) read each line as a string, search for the pattern and if matches
skip the write, otherwise write to a new file.
fid = fopen('yourfile');
c = textscan(fid, '%s %f %s');
fid=fclose(fid);
fid = fopen('newfile','rt');
ix=strfind(c(:,1),'abc');
for i=setdiff([1:size(c,1)],ix)
fprintf(fid,'%s %d %s\n');
end
fid=fclose(fid);
Caution--air code...salt to suit.
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