Thanks to all of you !
(Benjamin Nutter, Henrique Dallazuanna, Tobias Verbeke, Jorge Ivan Velez,
David Reinke and Gavin Simpson)


x <- c(1, 1, 1, NA, NA, 2, 1, NA)

> table(x)["1"]
1
4

Why do I get two numbers ?

Thanks,
Randall



2010/2/26 Nutter, Benjamin <NutterB@ccf.org>

> 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@r-project.org [mailto:r-help-bounces@r-project.org]
> On Behalf Of Henrique Dallazuanna
> Sent: Friday, February 26, 2010 9:47 AM
> To: Randall Wrong
> Cc: r-help@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@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@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<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@r-project.org mailing list
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
>
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