[R] read.delim very slow in reading files with lots of columns

[Benilton Carvalho]

use the 'colClasses' argument and you can also set 'nrows'.

b

On Sep 23, 2009, at 8:24 PM, Ping-Hsun Hsieh wrote:

> Hi,
>
>
>
> I am trying to read a tab-delimited file into R (Ver. 2.8). The  
> machine I am using is 64bit Linux with 16 GB.
>
> The file is basically a matrix(~600x700000) and as large as 3GB.
>
>
>
> The read.delim() ran extremely slow (hours) even with a subset of  
> the file (31 MB with 6x700000)
>
> I monitored the memory usage, and found it constantly only took less  
> than 1% of 16GB memory.
>
> Does read.delim() have difficulty to read files with lots of columns?
>
> Any suggestions?
>
>
>
> Thanks,
>
> Mike
>
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.