[R] Barplot with Secondary axis

[Greg Snow]

Using par(new=TRUE) will often cause more problems than it helps.

A better approach would be to use the twoord.plot function from the
plotrix package or to use the updateusr function from the
TeachingDemos package along with the lines function to add the lines
afterwards.

On Wed, Aug 22, 2012 at 7:43 AM, vikrant <vikrant.shimpi at tcs.com> wrote:
> Hi all,
>
> I am trying to plot a bar chart  and trying to plot a line as a secondary
> axis as my scale is different for two y axis.
>
> I am plotting a clustered bar chart by using besides = True option in
> barplot function and my y coordinates are not plotted exactly at the center
> on each two bars. Please help me.
>
> I am pasting the code as follows.
>
> x = c("a","b","c","d")
> y= cbind(c(50,40,30,20),c(40,30,20,10))
> y2 = c(0.80,0.65,0.75,0.50)
> barplot(t(y),beside = TRUE)
> par(new=T)
> plot(y2,,,type="o",col="black",lwd=
> 3,lty=1,xaxt="n",yaxt="n",xlab="",ylab="")
> points(y2,pch=20)
>
> I also tried following code for plotting the line point exactly at the
> center of two bars:
>
> x = c("a","b","c","d")
> y= cbind(c(50,40,30,20),c(40,30,20,10))
> y2 = c(0.80,0.65,0.75,0.50)
>  barplot(t(y),beside = TRUE)
> a = barplot(t(y),beside = TRUE)
> par(new=T)
> plot(colMeans(a),y2,type="l",col="black",lwd=
> 1,lty=1,xaxt="n",yaxt="n",xlab="",ylab="")
> points(colMeans(a),y2,pch=20)
>
> Please help me in plotting this graph
>
>
>
> --
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> Sent from the R help mailing list archive at Nabble.com.
>
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-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com