[R] using "table" in R

[jim holtman]

You can use 'names'

> d = as.data.frame(matrix(c(1, 2, 3, 3), 2,2))
>
> x <- table(unlist(d))
> x

1 2 3
1 1 2
> names(x)
[1] "1" "2" "3"
>


On 9/17/06, Søren Merser <merser at image.dk> wrote:
> hi, here's a way:
> > attr(table(unlist(d)),'dimnames')[[1]]
> [1] "1" "2" "3"
> > as.numeric(table(unlist(d)))
> [1] 1 1 2
> soren
>
> ----- Original Message -----
> From: "Bingshan Li" <bingshanli at yahoo.com>
> To: "jim holtman" <jholtman at gmail.com>
> Cc: <r-help at stat.math.ethz.ch>
> Sent: Sunday, September 17, 2006 6:14 AM
> Subject: Re: [R] using "table" in R
>
>
> > Hi Jim,
> >
> > This is the way to get the frequencies. But what I
> > want is to store the elements in one vector and their
> > frequencies in another vector. My problem is that when
> > I call "table" to return the frequency table, I do not
> > know how to extract these two vectors. I tried
> > table(...)$dinnames and it did not work. It returned
> > NULL.
> >
> > Thanks!
> >
> >
> > --- jim holtman <jholtman at gmail.com> wrote:
> >
> >> Here is one way; you create a vector of the data in
> >> the dataframe with
> >> 'unlist' and then use table:
> >>
> >> > d = as.data.frame(matrix(c(1, 2, 3, 3), 2,2))
> >> > d
> >>   V1 V2
> >> 1  1  3
> >> 2  2  3
> >> > table(unlist(d))
> >>
> >> 1 2 3
> >> 1 1 2
> >> >
> >>
> >>
> >> On 9/16/06, Bingshan Li <bingshanli at yahoo.com>
> >> wrote:
> >> > Hi there,
> >> >
> >> > I have a dataframe whose elements are numbers or
> >> > characters. I want to extract the frequencies of
> >> each
> >> > elements in the dataframe. For example,
> >> >
> >> > d = as.data.frame(matrix(c(1, 2, 3, 3), 2,2))
> >> >
> >> > What I want is first what are the elements in the
> >> data
> >> > (1,2,3 here) and second what are their frequencies
> >> > (1,1,2 respectively). How to use "table" to
> >> extract
> >> > these two pieces of information? I played with
> >> "table"
> >> > but couldn't extract the information. Please
> >> assume
> >> > that we do not know how many elements in the
> >> dataframe
> >> > a priori.
> >> >
> >> > Thanks a lot!
> >> >
> >> > ______________________________________________
> >> > R-help at stat.math.ethz.ch 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.
> >> >
> >>
> >>
> >> --
> >> Jim Holtman
> >> Cincinnati, OH
> >> +1 513 646 9390
> >>
> >> What is the problem you are trying to solve?
> >>
> >
> > ______________________________________________
> > R-help at stat.math.ethz.ch 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.
>
> ______________________________________________
> R-help at stat.math.ethz.ch 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.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?