R help - Feb 2009 - Have a function like the "_n_" in R ? (Automatic count function)

> temp=data.frame(a=c(4,3,2,6),b=c(7,4,2,4))
> temp
  a b
1 4 7
2 3 4
3 2 2
4 6 4
> temp$counter=1:nrow(temp)
> temp
  a b counter
1 4 7       1
2 3 4       2
3 2 2       3
4 6 4       4

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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Nash
Sent: Wednesday, February 25, 2009 5:55 PM
To: r-help
Subject: [R] Have a function like the "_n_" in R ? (Automatic count
function)


Have the counter function in R ?

if we use the software SAS

/*** SAS Code **************************/
data tmp(drop= i);
retain seed x 0;
do i = 1 to 5;
	call ranuni(seed,x);
	output;
end;
run;

data new;
counter=_n_;  ***** this keyword _n_ ****;
set tmp;
run;

/*
_n_ (Automatic variables)
are created automatically by the DATA step or by DATA step statements.
*/

/*** Output ********************************
counter	     seed             x
1	584043288	         0.27197
2	935902963	         0.43581
3	301879523	         0.14057
4	753212598	         0.35074
5	1607264573	0.74844

********************************************/

Have a function like the "_n_" in R ?


--
Nash - morrison at ibms.sinica.edu.tw

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