[R] counting the number of ones in a vector

[Nutter, Benjamin]

But if x has any missing values:

> x <- c(1, 1, 1, NA, NA, 2, 1, NA)
> 
> sum( x == 1)
[1] NA
> 
> sum(x==1, na.rm=TRUE)
[1] 4




-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Henrique Dallazuanna
Sent: Friday, February 26, 2010 9:47 AM
To: Randall Wrong
Cc: r-help at r-project.org
Subject: Re: [R] counting the number of ones in a vector

Try:

sum(x == 1)

On Fri, Feb 26, 2010 at 11:40 AM, Randall Wrong <randall.wrong at gmail.com> wrote:
> Dear R users,
>
> I want to count the number of ones in a vector x.
>
> That's what I did : length( x[x==1] )
>
> Is that a good solution ?
> Thank you very much,
> Randall
>
>        [[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.
>



--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

______________________________________________
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.


===================================

P Please consider the environment before printing this e-mail

Cleveland Clinic is ranked one of the top hospitals
in America by U.S.News & World Report (2009).  
Visit us online at http://www.clevelandclinic.org for
a complete listing of our services, staff and
locations.


Confidentiality Note:  This message is intended for use\...{{dropped:13}}