#Example

#Step_1


First let's make a simple bar chart:

>x <- c(3,2,6,8,4)
>barplot(x)

#Step_2


Let's add some annotations:

>barplot(x,border="tan2",names.arg=c("Jan","Feb","Mar","Apr","May"),
+ xlab="Month",ylab="Revenue",density=c(0,5,20,50,100))

#Step_3

Suppose the bar chart above is about software department of our company, we are going to compare other department's revenues including hardware and services:

>A <- matrix(c(3,5,7,1,9,4,6,5,2,12,2,1,7,6,8),nrow=3,ncol=5,byrow=TRUE)
>barplot(A,main="total revenue",names.arg=c("Jan","Feb","Mar","Apr","May"),
+ xlab="month",ylab="revenue",col=c("tan2","blue","darkslategray3"))
>legend(x=0.2,y=24,c("soft","hardware","service"),cex=.8, 
+ col=c("tan2","blue","darkslategray3"),pch=c(22,0,0))

#Step_4

Let's compare the data sets horizontally:

>barplot(A,main="total revenue",beside=TRUE,
+ names.arg=c("Jan","Feb","Mar","Apr","May"),
+ xlab="month",ylab="revenue",col=c("tan2","blue","darkslategray3"))
>legend(x=1,y=11,c("soft","hardware","service"),cex=.8, 
+ col=c("tan2","blue","darkslategray3"),pch=c(22,0,0))

@R_Experts