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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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Benoit Valley

Posts: 16
Registered: 10/19/05
Re: Number of line in a text file
Posted: Nov 10, 2006 4:56 AM
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Ok. I have now a very efficient way to know the number of line in my
text file. Is it now possible to read very quickly just the last line
of the file ?

fgetl do not permit to acceed directly the last line of the file.

using dlmread with appropriate range is slow. Is there a quick way to
get the content of the last line ?

Thanks for your helps.


Benoît Valley wrote:
> Thanks a lot for your explanations.
> Benoît.
> Kirill wrote:

>> Indeed -- 4.65sec vs former 7.6sec!!!
>> JWagberg wrote:

>>> Kirill wrote:
>>> > while ~feof(fh)
>>> > ch = fread(fh, chunksize, 'uchar');
>>> > if isempty(ch)
>>> > break
>>> > end

>>> ...
>>> > n2 = n2 + sum(ch == char(10));
>>> Prepend the 'uchar' with an asterisk, '*uchar', and you can

> read
>> eight
>>> times as much with each chunk and the (ch == char(10)) will
> also
>> speed
>>> up by a factor five.
>>> /jewa


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