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Topic: Number of line in a text file
Replies: 12   Last Post: Jan 23, 2013 1:51 PM

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JWagberg

Posts: 138
Registered: 1/30/06
Re: Number of line in a text file
Posted: Nov 2, 2006 10:51 AM
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Benoît Valley wrote:
> And what are the commands to break the file in parts before reading
> it ?
>
> Thanks for your useful suggestion and help.
> Benoît
>
> Kirill wrote:

> >
> >
> > You will need to read it anyway so the only resort is to reduce
> > function call overhead: reading it by bug chunks, 10th or 100ths
> > megabytes, will be much faster.
> > Kirill
> >
> > Benoît Valley wrote:

> >> I need to determine the number of line in a text file.
> >>
> >> Is there a more efficient way that using getl in a while loop ?
> >>
> >> Thanks,
> >> Benoît

> >
> >


No need to break it up. If the file fits in memory, the following will
render you the number of lines:

fd=fopen('foo.txt');
q=fread(fd,inf,'*uchar');
fclose(fd);
nlines=sum(q==10);

This works on a PC or UNIX textfile. Guess you have to replace '10' for
'13' on a MAC.

If the file is huge, modify it to read in chunks.

/jewa




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