can not read this file

1 次查看（过去 30 天）
huda nawaf
huda nawaf 2012-4-24
hi
I have txt file with big size (570 MB). I try to read it
by this code:
f1=fopen('d:\matlab11\bin\test1.txt');
c=textscan(f1,'%d %d %f %s %s');
fclose(f1);
c1=c{1}; c2=c{2};c3=c{3};c4=c{4};c5=c{5};
u_user=unique(c1);
u_movie=unique(c2);
%%%%%%%%%%%%%%%%
but I did not get the sme data and not all.
I tried with small part from the same data , I got correct data.
this is the sample:
852910 47995 5 2008-08-16 00:00:00
852910 49280 4.5 2008-05-05 00:00:00
852910 49325 4.5 2008-06-10 00:00:00
852910 48116 5 2008-01-12 00:00:00
how I can read this big size file?
thanks in advance
  1 个评论
Oleg Komarov
Oleg Komarov 2012-4-24
Then the file could be corrupt, check it from where you stopped reading it.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Ken Atwell
Ken Atwell 2012-4-24
textscan can return a second output, "pos", which will return the position that textscan stopped at if an error occurred (which seems to be the case here). You can also determine where the error is by the length of what textscan managed return in the first output. If you text file is, say, 10000 row long and c{1} is only 1234 rows long, your error is around that row.
  1 个评论
huda nawaf
huda nawaf 2012-4-25
thanks,
in fact it is not error but when need see c1
i get Empty matrix: 0-by-1
the no. of rows is 8196077.
I would like to say that my code can read the same file (the same no. of rows) but with three columns correctly .why when be five columns with same no. of rows get empty matrix?

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Large Files and Big Data 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by