[R-sig-Geo] count how many row i have in a txt file in a directory

[Rainer Hurling]

On 26.02.2012 15:03 (UTC+1), gianni lavaredo wrote:
> Dear Researchers,
>
> I have a large TXT (X,Y,MyValue) file in a directory and I wish to import
> row by row the txt in a loop to save only the data they are inside a buffer
> (using inside.owin of spatstat) and delete the rest. The first step before
> to create a loop row-by-row is to know how many rows there are in the txt
> file without load in R to save memory problem.

If I remember right from another thread, you are on Max OSX?

If so, you could try Unix alike commands like 'wc' (word count) with 
option 'l' for lines:

#as.numeric(unlist(strsplit(system("wc -l file.txt", intern=TRUE), 
split=" "))[2])

I suspect, there must be other, much more elegant methods ...

Rainer

> some people know the specific function?
>
> thanks in advance for all suggestions
> Gianni