On 01/02/2010 12:53 PM, elaine kuo wrote:
Dear,
I am a newbie to R.
Now I am learning to draw boxplot using graphics().
I want to highlight the median position
with a round point and the value left (or on the top of)to the point.
Hi Elaine,
For your boxplot questions, I'll use the first example from the boxplot
help page:
boxplot(count ~ spray, data = InsectSprays,
col = "lightgray",yaxt="n")
axis(2,c(2,8,14,20),c(2,8,14,20))
For the "dotted to solid" question:
boxplot_info<-boxplot(count ~ spray,
data = InsectSprays,col = "lightgray")
segments(rep(1:6,each=2),boxplot_info$stats[c(1,4),],
rep(1:6,each=2),boxplot_info$stats[c(2,5),])
And finally, for the median value question:
boxplot_info<-boxplot(count ~ spray, data = InsectSprays,
col = "lightgray")
points(1:6,boxplot_info$stats[3,])
text(1:6,boxplot_info$stats[3,]+1,boxplot_info$stats[3,])
A bit messy, but you get the idea.
Jim
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