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add reference lines (or grid) in background

6 messages · Luigi Marongiu, Jose Iparraguirre, Jim Lemon +2 more

Jose Iparraguirre
# 
Dear Luigi,

Here's an option:

boxplot(x, boxcol="white", whiskcol="white",medcol="white",staplecol="white")
abline(h=c(-1,0,1))
grid(NA, 4, lwd = 2)
boxplot(x,add=T)

Regards,

Jos? Iparraguirre



-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Luigi
Sent: 18 September 2012 09:36
To: r-help at r-project.org
Subject: [R] add reference lines (or grid) in background

Dear all,

Is there a simple way to add reference lines in background? I am trying with
abline() or grid() but the lines, since they are executed after the plot
function, are draw on top. How can I draw such lines beneath the main plot?
Here is an example:

 

x<-rnorm(100)

boxplot(x)

abline(h=c(-1,0,1))

grid(NA, 4, lwd = 2)

 

regards,

 

Luigi Marongiu, MSc

 



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Jim Lemon
#
On 09/18/2012 06:35 PM, Luigi wrote:
Hi Luigi,
There are a few different ways to get your grid "under" the plot. 
Perhaps the most straightforward is to display the plot, then the grid, 
then "add" the plot on top using the "add" argument.

The box.heresy plot in the plotrix package is one of the functions that 
has a "do.first" argument. This can be a call to "grid" and displays the 
grid before the plot. This involves only one call, but it is a bit 
different from the standard boxplot.

Jim
John Kane
# 
Not sure if it is quite the same but ggplot2 does this as its default formatting.

library(ggplot2)
x<-rnorm(100)
qplot(factor(0),x, geom="boxplot")

John Kane
Kingston ON Canada
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Kenn Konstabel
# 
There is a "panel.first" argument that can be used with many different
types of plots.

plot(x, panel.first=abline(h=-3:3, lty="dotted", col="gray"), pch=16,
col="red", cex=3)
# red big plotting characters: to show that ablines are drawn before plotting
# the result is different from doing the plot first and abline's after that.

But this doesn't work with boxplot: ablines are drawn (so panel.first
does something) but then overplotted.

boxplot(x, panel.first=abline(h=-3:3,  lwd=100, col="red"))
# lwd=100: this would be absurd if it worked but now I can see only
something red flashing
# on the screen before the boxplot is drawn

Maybe there are some extra parameters to boxplot or bxp (which does
the drawing) that could be used (from what I see on the screen I can
imagine that the ablines are first drawn but deleted by the white
background of boxplot; so it might help to make this background
transparent instead of white; but I haven't examined the code so can't
be sure this is what bxp does). Or it might be easier to do it with
ggplot.

Regards,

Kenn Konstabel
On 9/18/12, John Kane <jrkrideau at inbox.com> wrote:
Luigi Marongiu
# 
Dear all ,
Thank you for the replies. The idea of plotting back on top of the grid was
the right direction and after browsing and browsing I found a tip in the R
archive ([R] How to get a grid behind a boxplot) by Neuro LeSuperH?ros which
uses par(new=T):


x<-rnorm(100)
boxplot(x)
abline(h=c(-1,0,1))
grid(NA, 4, lwd = 2)
par(new=TRUE)
boxplot(x, col="white")

best wishes,
Luigi