If you are in the context of a data frame (which is closest to the
concept
of a "data set" in SAS), the 1:nrow(df) is closest to what you may look
for.
For instance:
data(iris)
.n. <- 1:nrow(iris)
You may notice that this number is not very idiomatic in R.
If you have something like:
if(_N_ > 50) then output;
in R you can simply put
iris[-(1:50),]
without using an explicit counter variable.
In the context of a matrix, the row() and col() functions may do what
you want.
Am 25.02.2009 um 15:34 schrieb justin bem:
R is more flexible that SAS. You have many functions for loop e.g.
for, while, repeat. You also have dim and length functions to get
objects dimensions.
i<-0
dat<-matrix(c(1, runif(1), .Random.seed[1]),nr=1)
repeat{
i=i+1
dat<-rbind(dat, matrix(c(1+i, runif(1), .Random.seed[1]),nr=1))
if (i==4) break
}
colnames(dat)<-c("counter", "x","seed")
dat
Justin BEM
BP 1917 Yaoundé
Tél (237) 99597295
(237) 22040246
________________________________
De : Nash <morri...@ibms.sinica.edu.tw>
À : r-help <r-help@r-project.org>
Envoyé le : Mercredi, 25 Février 2009, 13h25mn 18s
Objet : [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 - morri...@ibms.sinica.edu.tw
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______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@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.
