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From: Reza Zare on 22 Jul 2010 04:50
Hello All,

I have a text file( sample.txt) containing some numbers, I wana write all the similar number into another file and delete them from original file? pls advise me on this... my code is as follow: for this case, first, fourth and fifth line are having similar number, so I have written this three numbers into another file, how can I delete them from the sample.txt.

sample.txt
**********************
1880 1121-127-700-500
1882 1121-115-710-400
1891 1121-115-700-400
1892 1121-127-700-500
1893 1121-127-700-500
...

**********************
for i=1:12
fid=fopen('sample.txt');
c=textscan(fid,'%s %s');
a=c{2}{1};
a1=c{2}{i};
tf=isequal(a,a1);
if (tf==1)
fid1=fopen('class1.txt','a+');
fwrite(fid1, c{1}{i});
end
end
fclose(fid1);
fclose(fid);
From: Nic Roberts on 22 Jul 2010 06:58
One option would be to open another file omitting the unwanted data. You could then delete th old file and rename the new one.

Nic

"Reza Zare" <persianfriend12(a)yahoo.com> wrote in message <i290o4$c6p$1(a)fred.mathworks.com>...
> Hello All,
>
> I have a text file( sample.txt) containing some numbers, I wana write all the similar number into another file and delete them from original file? pls advise me on this... my code is as follow: for this case, first, fourth and fifth line are having similar number, so I have written this three numbers into another file, how can I delete them from the sample.txt.
>
> sample.txt
> **********************
> 1880 1121-127-700-500
> 1882 1121-115-710-400
> 1891 1121-115-700-400
> 1892 1121-127-700-500
> 1893 1121-127-700-500
> ...
>
> **********************
> for i=1:12
> fid=fopen('sample.txt');
> c=textscan(fid,'%s %s');
> a=c{2}{1};
> a1=c{2}{i};
> tf=isequal(a,a1);
> if (tf==1)
> fid1=fopen('class1.txt','a+');
> fwrite(fid1, c{1}{i});
> end
> end
> fclose(fid1);
> fclose(fid);
From: Reza Zare on 22 Jul 2010 13:12
"Reza Zare" <persianfriend12(a)yahoo.com> wrote in message <i290o4$c6p$1(a)fred.mathworks.com>...
> Hello All,
>
> I have a text file( sample.txt) containing some numbers, I wana write all the similar number into another file and delete them from original file? pls advise me on this... my code is as follow: for this case, first, fourth and fifth line are having similar number, so I have written this three numbers into another file, how can I delete them from the sample.txt.
>
> sample.txt
> **********************
> 1880 1121-127-700-500
> 1882 1121-115-710-400
> 1891 1121-115-700-400
> 1892 1121-127-700-500
> 1893 1121-127-700-500
> ...
>
> **********************
> for i=1:12
> fid=fopen('sample.txt');
> c=textscan(fid,'%s %s');
> a=c{2}{1};
> a1=c{2}{i};
> tf=isequal(a,a1);
> if (tf==1)
> fid1=fopen('class1.txt','a+');
> fwrite(fid1, c{1}{i});
> end
> end
> fclose(fid1);
> fclose(fid);
From: Reza Zare on 22 Jul 2010 13:15
and that's my question, how to omit an unwanted data, whether in the original file or a new file, it does not matter, what my question is that how to delete those data?



"Reza Zare" <persianfriend12(a)yahoo.com> wrote in message <i290o4$c6p$1(a)fred.mathworks.com>...
> Hello All,
>
> I have a text file( sample.txt) containing some numbers, I wana write all the similar number into another file and delete them from original file? pls advise me on this... my code is as follow: for this case, first, fourth and fifth line are having similar number, so I have written this three numbers into another file, how can I delete them from the sample.txt.
>
> sample.txt
> **********************
> 1880 1121-127-700-500
> 1882 1121-115-710-400
> 1891 1121-115-700-400
> 1892 1121-127-700-500
> 1893 1121-127-700-500
> ...
>
> **********************
> for i=1:12
> fid=fopen('sample.txt');
> c=textscan(fid,'%s %s');
> a=c{2}{1};
> a1=c{2}{i};
> tf=isequal(a,a1);
> if (tf==1)
> fid1=fopen('class1.txt','a+');
> fwrite(fid1, c{1}{i});
> end
> end
> fclose(fid1);
> fclose(fid);
From: Walter Roberson on 22 Jul 2010 13:43
Reza Zare wrote:
> and that's my question, how to omit an unwanted data, whether in the
> original file or a new file, it does not matter, what my question is
> that how to delete those data?

Just don't write them to the new file.

Deleting data "in place" in an existing file is often not possible without
unacceptable consequences. Creating a new file that only holds the things you
_do_ want is a much less risky mechanism.
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