R help - Oct 2010 - Beginner question on bar plot

I've read a number of examples on doing a multiple bar plot, but cant seem
to grasp
how they work or how to get my data into the proper form.

I have two  variable holding the same factor

The variables were created using a cut command, The following simulates that

A <- 1:100
B <- 1:100
 A[30:60] <- 43
 Acut <-
cut(A,breaks=c(0,10,45,120),labels=c("low","med","high"))
 Bcut <-
cut(B,breaks=c(0,10,45,120),labels=c("low","med","high"))

What I want to do is create a barplot with  3 groups of side by side bars

group 1, = "low" and the two bars would be the count for Acut, and the
count
for Bcut
group 2 = "med" and the two bars again would be the counts for  this
factor
level in Acut and Bcut
group 3 = high  and like the above two.

	[[alternative HTML version deleted]]

Tena koe Steven

cutData <- rbind(summary(Acut), summary(Bcut))
barplot(cutData, beside=TRUE)

should get you started.  The challenge, as you identify, is to get the data into
the appropriate form and the simple approach I have used may not work for your
real data.

HTH ....


Peter Alspach
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of steven mosher
> Sent: Saturday, 16 October 2010 9:01 a.m.
> To: r-help
> Subject: [R] Beginner question on bar plot
> 
> I've read a number of examples on doing a multiple bar plot, but cant
> seem
> to grasp
> how they work or how to get my data into the proper form.
> 
> I have two  variable holding the same factor
> 
> The variables were created using a cut command, The following simulates
> that
> 
> A <- 1:100
> B <- 1:100
>  A[30:60] <- 43
>  Acut <-
cut(A,breaks=c(0,10,45,120),labels=c("low","med","high"))
>  Bcut <-
cut(B,breaks=c(0,10,45,120),labels=c("low","med","high"))
> 
> What I want to do is create a barplot with  3 groups of side by side
> bars
> 
> group 1, = "low" and the two bars would be the count for Acut,
and the
> count
> for Bcut
> group 2 = "med" and the two bars again would be the counts for 
this
> factor
> level in Acut and Bcut
> group 3 = high  and like the above two.
> 
> 	[[alternative HTML version deleted]]
> 
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> PLEASE do read the posting guide http://www.R-project.org/posting-
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