R help - Sep 2006 - Axes of a histogram

Hello everyone,

I would be glad if you could help out an R-beginner here... I have a
vector of categorial data like this
> v <- c(1, 1, 2, 2, 2, 3, 3, 4, 4, 4)
When I do
> hist(v)
I get the x-axis of the histogram with floating point labels: 1.0, 1.5,
2.0, etc. Is it possible to tell R that the data consists of categories,
i.e. that I only want the category names (1, 2, 3, 4) on my x-axis?

Thanks in advance,
Rehceb Rotkiv

probably you're looking for a barplot, e.g.,

v <- c(1, 1, 2, 2, 2, 3, 3, 4, 4, 4)
plot(factor(v))


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "Rotkiv, Rehceb" <kungfista at gmx.de>
To: <r-help at stat.math.ethz.ch>
Sent: Thursday, September 07, 2006 2:35 PM
Subject: [R] Axes of a histogram

> Hello everyone,
>
> I would be glad if you could help out an R-beginner here... I have a
> vector of categorial data like this
>
>> v <- c(1, 1, 2, 2, 2, 3, 3, 4, 4, 4)
>
> When I do
>
>> hist(v)
>
> I get the x-axis of the histogram with floating point labels: 1.0, 
> 1.5,
> 2.0, etc. Is it possible to tell R that the data consists of 
> categories,
> i.e. that I only want the category names (1, 2, 3, 4) on my x-axis?
>
> Thanks in advance,
> Rehceb Rotkiv
>
> ______________________________________________
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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.
> 

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On Thu, 2006-09-07 at 14:35 +0200, Rotkiv, Rehceb wrote:
> Hello everyone,
> 
> I would be glad if you could help out an R-beginner here... I have a
> vector of categorial data like this
> 
> > v <- c(1, 1, 2, 2, 2, 3, 3, 4, 4, 4)
> 
> When I do
> 
> > hist(v)
> 
> I get the x-axis of the histogram with floating point labels: 1.0, 1.5,
> 2.0, etc. Is it possible to tell R that the data consists of categories,
> i.e. that I only want the category names (1, 2, 3, 4) on my x-axis?
> 
> Thanks in advance,
> Rehceb Rotkiv
You don't want a histogram, but a barplot:

  barplot(table(v))

See ?barplot and ?table

HTH,

Marc Schwartz